Bump git2 from 0.18.3 to 0.19.0

Bumps [git2](https://github.com/rust-lang/git2-rs) from 0.18.3 to 0.19.0.
- [Changelog](https://github.com/rust-lang/git2-rs/blob/master/CHANGELOG.md)
- [Commits](rust-lang/git2-rs@git2-0.18.3...git2-0.19.0)

---
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 = "0.18"
+git2 = "0.19"
 git2-hooks = { path = "../git2-hooks", version = "0.3" }
 log = "0.4"
 # git2 = { path = "../../extern/git2-rs", features = ["vendored-openssl"]}