Auto merge of rust-lang#10557 - Mrmaxmeier:backport-libgit2-update, r…

…=ehuss

Backport git2 update rust-lang#10442 as 0.61.1

This is a version bump and backport of the git2 updates in rust-lang#10442 to the `rust-1.60.0` branch.

Closes rust-lang#10446

0.61.0 release

0.60.0 release

0.59.0 release

0.58.0 release

0.58.0 release

0.57.0 release

0.56.0 release

0.55.0 release

0.54.0 release