Update to git2 0.20.1 (#26972)

Switch back to git2 releases after
https://github.com/rust-lang/git2-rs/pull/1120 got merged in 0.20.1

Release Notes:

- N/A
a5621662b2tidely committed on 3/18/2025, 8:05:15 AM· committed by GitHubparentb6198ad
2 files changedLine totals unavailable