Bumps [git2](https://github.com/rust-lang/git2-rs) from 0.20.4 to 0.21.0. <details> <summary>Changelog</summary> <p><em>Sourced from <a href="https://github.com/rust-lang/git2-rs/blob/main/CHANGELOG.md">git2's changelog</a>.</em></p> <blockquote> <h2>0.21.0 - TBD</h2> <p><a href="https://github.com/rust-lang/git2-rs/compare/git2-0.20.4...main">0.20.4...main</a></p> <h3>Added</h3> <ul> <li>Added experimental SHA256 repository support behind the new <code>unstable-sha256</code> Cargo feature, along with <code>*_ext</code> API variants that accept an <code>ObjectFormat</code>. <a href="https://redirect.github.com/rust-lang/git2-rs/pull/1206">#1206</a></li> <li>Added <code>opts::set_cache_max_size()</code> and <code>opts::get_cached_memory()</code>. <a href="https://redirect.github.com/rust-lang/git2-rs/pull/1188">#1188</a></li> <li>Added <code>Repository::object_format()</code> and a new <code>ObjectFormat</code> enum. <a href="https://redirect.github.com/rust-lang/git2-rs/pull/1204">#1204</a></li> <li>Added <code>Repository::set_config()</code>. <a href="https://redirect.github.com/rust-lang/git2-rs/pull/1208">#1208</a></li> <li>Added <code>merge_file()</code> along with <code>MergeFileInput</code>. <a href="https://redirect.github.com/rust-lang/git2-rs/pull/1210">#1210</a></li> <li>Added <code>Repository::refdb_compress()</code> for packing loose refs. <a href="https://redirect.github.com/rust-lang/git2-rs/pull/1221">#1221</a></li> <li>Added public <code>Refdb</code> type, along with <code>Repository::refdb()</code> and <code>Repository::set_refdb()</code>. <code>Repository::refdb_compress()</code> now delegates to <code>Refdb::compress()</code>. <a href="https://redirect.github.com/rust-lang/git2-rs/pull/1228">#1228</a></li> <li>Added <code>Revspec::into_objects()</code>. <a href="https://redirect.github.com/rust-lang/git2-rs/pull/1230">#1230</a></li> <li>Added <code>BlameHunk::final_committer()</code>, <code>BlameHunk::orig_committer()</code>, <code>BlameHunk::summary()</code>, and <code>BlameHunk::summary_bytes()</code>. <a href="https://redirect.github.com/rust-lang/git2-rs/pull/1231">#1231</a></li> <li>Implemented <code>Clone</code> for <code>Reference</code>. <a href="https://redirect.github.com/rust-lang/git2-rs/pull/1233">#1233</a></li> <li>Added <code>Repository::author_from_env()</code> and <code>Repository::committer_from_env()</code>. <a href="https://redirect.github.com/rust-lang/git2-rs/pull/1237">#1237</a></li> <li>Added <code>impl From<Utf8Error> for Error</code>. <a href="https://redirect.github.com/rust-lang/git2-rs/pull/1239">#1239</a></li> </ul> <h3>Changed</h3> <ul> <li>❗ The <code>ssh</code>, <code>https</code>, and <code>cred</code> Cargo features are no longer enabled by default. Previously <code>default = ["ssh", "https"]</code>; now <code>default = []</code>. Enable them explicitly if you rely on credential helpers or transport support. <a href="https://redirect.github.com/rust-lang/git2-rs/pull/1168">#1168</a></li> <li>❗ <code>CredentialHelper</code> and the <code>url</code> dependency are now gated behind the new <code>cred</code> Cargo feature. Enabling <code>ssh</code> or <code>https</code> transitively enables <code>cred</code>. <a href="https://redirect.github.com/rust-lang/git2-rs/pull/1168">#1168</a></li> <li>❗ Updated to the 2021 edition. <a href="https://redirect.github.com/rust-lang/git2-rs/pull/1173">#1173</a></li> <li>❗ Many string accessors that previously returned <code>Option<&str></code> now return <code>Result<&str, Error></code> or <code>Result<Option<&str>, Error></code>, so callers can distinguish a missing value from a non-UTF-8 one. <a href="https://redirect.github.com/rust-lang/git2-rs/pull/1241">#1241</a></li> <li>❗ <code>BlameHunk::final_signature</code>, <code>BlameHunk::final_committer</code>, <code>BlameHunk::orig_signature</code>, and <code>BlameHunk::orig_committer</code> now return <code>Option</code> to avoid segfaults when signature information is missing. <a href="https://redirect.github.com/rust-lang/git2-rs/pull/1254">#1254</a></li> <li>Bumped requirement to libgit2-sys 0.18.4, which updates libgit2 to 1.9.3.</li> </ul>  </blockquote> <p>... (truncated)</p> </details> <details> <summary>Commits</summary> <ul> <li><a href="https://github.com/rust-lang/git2-rs/commit/dffaf272eb0e62ac15b74283c4e488252db9afc3"><code>dffaf27</code></a> Merge pull request <a href="https://redirect.github.com/rust-lang/git2-rs/issues/1256">#1256</a> from weihanglo/changelog</li> <li><a href="https://github.com/rust-lang/git2-rs/commit/84b9c76ee516cc514978db0e51fd6750cc215326"><code>84b9c76</code></a> docs: changelog for git2@0.21</li> <li><a href="https://github.com/rust-lang/git2-rs/commit/8c6dc4a336a2671c4a56e15159c4ea4e102388f6"><code>8c6dc4a</code></a> Merge pull request <a href="https://redirect.github.com/rust-lang/git2-rs/issues/1206">#1206</a> from weihanglo/sha256-git2</li> <li><a href="https://github.com/rust-lang/git2-rs/commit/7bd145ee23884f19d1d79ce0e46c1ab105784040"><code>7bd145e</code></a> fix: import <code>ObjectFormat</code> in one place</li> <li><a href="https://github.com/rust-lang/git2-rs/commit/fc8af6ad26b0e1bc126d997cf30407e8561195c6"><code>fc8af6a</code></a> test(oid): split <code>_ext</code> to test each format separately</li> <li><a href="https://github.com/rust-lang/git2-rs/commit/b9bde87d80eb58cc87afe22e16bd581c2bb11618"><code>b9bde87</code></a> test: oid length sanity check</li> <li><a href="https://github.com/rust-lang/git2-rs/commit/57a68e0729a014e92e0704c3382037f36979c13d"><code>57a68e0</code></a> feat(oid): impl Display for ObjectFormat</li> <li><a href="https://github.com/rust-lang/git2-rs/commit/7acee09983d45fb6b3c0680e59838fb9619e5149"><code>7acee09</code></a> chore(ci): test git2 sha256 support</li> <li><a href="https://github.com/rust-lang/git2-rs/commit/bdf5b7bf4aa13b9a2ed6e85d8d2d884b83fffcc7"><code>bdf5b7b</code></a> fix: init example with <code>--object-format</code> option</li> <li><a href="https://github.com/rust-lang/git2-rs/commit/9fb4e6aeaeb17868c5e86e8ee67545c57d070ced"><code>9fb4e6a</code></a> refactor(util): drop <code>unsafe</code> from <code>zeroed_raw_oid</code></li> <li>Additional commits viewable in <a href="https://github.com/rust-lang/git2-rs/compare/git2-0.20.4...git2-0.21.0">compare view</a></li> </ul> </details> <br /> [![Dependabot compatibility score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=git2&package-manager=cargo&previous-version=0.20.4&new-version=0.21.0)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores) Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. 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