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Add advisory for git2: Remote::list() with an empty list triggers UB #2888

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Add advisory for git2: Remote::list() with an empty list triggers UB #2888

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16 changes: 16 additions & 0 deletions crates/git2/RUSTSEC-0000-0000.md
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```toml
[advisory]
id = "RUSTSEC-0000-0000"
package = "git2"
date = "2026-05-12"
url = "https://github.com/rust-lang/git2-rs/pull/1250"
informational = "unsound"
keywords = ["git2"]

[versions]
patched = ["> 0.20.4"]
```

# Potential undefined behavior when calling Remote::list()

When calling `Remote::list()` for a remote of a git repository, when that remote does not advertise any references, git2 passes a null pointer to the unsafe function `slice::from_raw_parts()`. Based on the safety section documentation of function, data must be non-null even for slices of length zero. Thus, the use of a null pointer leads to undefined behavior.