Bump git2 from 0.15.0 to 0.16.1

Bumps [git2](https://github.com/rust-lang/git2-rs) from 0.15.0 to 0.16.1.
- [Release notes](https://github.com/rust-lang/git2-rs/releases)
- [Changelog](https://github.com/rust-lang/git2-rs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rust-lang/git2-rs/compare/git2-curl-0.15.0...0.16.1)

---
updated-dependencies:
- dependency-name: git2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Cargo.toml

@@ -67,7 +67,7 @@ walkdir = { version = "2.0", optional = true }
 bytesize = { version = "1.1.0" }
 
 [dependencies.git2]
-version = "0.15"
+version = "0.16"
 optional = true
 default-features = false