build(deps): bump github.com/go-git/go-git/v5 from 5.13.1 to 5.16.5 (#18667)

Bumps [github.com/go-git/go-git/v5](https://github.com/go-git/go-git) from 5.13.1 to 5.16.5.
- [Release notes](https://github.com/go-git/go-git/releases)
- [Commits](https://github.com/go-git/go-git/compare/v5.13.1...v5.16.5)

---
updated-dependencies:
- dependency-name: github.com/go-git/go-git/v5
  dependency-version: 5.16.5
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>
Signed-off-by: Andrew Lytvynov <awly@tailscale.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

shell.nix

@@ -16,4 +16,4 @@
 ) {
   src =  ./.;
 }).shellNix
-# nix-direnv cache busting line: sha256-A3mjdGE6B5t6sdkHieZZGVYlCyvhdrcqpNaHxISAPuk=
+# nix-direnv cache busting line: sha256-8J1iLhnLzrLrh6MFLcCyO+iYT0jjczxNDW3O6a6f+xM=