Bump git2 from 0.19.0 to 0.20.0

Bumps [git2](https://github.com/rust-lang/git2-rs) from 0.19.0 to 0.20.0.
- [Changelog](https://github.com/rust-lang/git2-rs/blob/master/CHANGELOG.md)
- [Commits](rust-lang/git2-rs@git2-0.19.0...git2-0.20.0)

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

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

Author: dependabot[bot]

Cargo.lock

@@ -17,7 +17,7 @@ crossbeam-channel = "0.5"
 dirs = "5.0"
 easy-cast = "0.5"
 fuzzy-matcher = "0.3"
-git2 = "0.19"
+git2 = "0.20"
 git2-hooks = { path = "../git2-hooks", version = ">=0.4" }
 gix = { version = "0.67", default-features = false, features = [
     "max-performance",