Update pkg-config requirement from = 0.3.15 to = 0.3.25

[dependabot]

Updates the requirements on pkg-config to permit the latest version.

Changelog

Sourced from pkg-config's changelog.

[0.3.25] - 2022-03-31

Added

• Support for parsing -Wl linker arguments from the Libs lines and passing them to the linker as well as making them available via Library::ld_args (#131).

Changed

• Use SPDX license format and remove obsolete badge info (#129).

[0.3.24] - 2021-12-11

Fixed

• Re-add target_supported(), which was accidentally removed in 0.3.15 (#128).

[0.3.23] - 2021-12-06

Changed

• Improve error messages when a pkg-config package can't be found (#127).

[0.3.22] - 2021-10-24

Fixed

• pkg-config compiles again with Rust 1.30 or newer. 0.3.21 accidentally made use of API only available since 1.40 (#124, #125).

Changed

• Switched from Travis to GitHub Actions for the CI. Travis is dysfunctional since quite some time (#126).

[0.3.21] - 2021-10-22

Fixed

• Tests succeed again on macOS (#122).

Changed

• Improve error message in case of missing pkg-config and provide instructions how it can be installed (#121).

[0.3.20] - 2021-09-25

Fixed

... (truncated)

Commits

• 4246c5a Release 0.3.25
• 66404f9 Merge pull request #131 from eulegang/master
• 225a4a7 Removing header include flags in linker args handler
• 337d9a9 renaming ld_options -> ld_args
• 90b9291 retriggering ci
• f5731f7 Fixing matches! macro support
• dfebb0f Ignoring already handled -Wl options, switching to comma split args
• 55cc009 Restructuring to support pass through ld options
• 9465edd Adding rpath support
• d442626 Merge pull request #129 from atouchet/crgo
• Additional commits viewable in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot squash and merge will squash and merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge and block automerging
• @dependabot reopen will reopen this PR if it is closed
• @dependabot close will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
• @dependabot ignore this major version will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this minor version will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)

[patrickoppel]

Check required, if pkg-config 0.3.25 breaks kubos-linux-build

[dependabot]

Superseded by #14.