[Cargo]: Bump git2 from 0.20.3 to 0.20.4

Bumps [git2](https://github.com/rust-lang/git2-rs) from 0.20.3 to 0.20.4.
- [Changelog](https://github.com/rust-lang/git2-rs/blob/git2-0.20.4/CHANGELOG.md)
- [Commits](rust-lang/git2-rs@git2-0.20.3...git2-0.20.4)

---
updated-dependencies:
- dependency-name: git2
  dependency-version: 0.20.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Cargo.lock

@@ -27,7 +27,7 @@ tracing-subscriber = { version = "0.3.22", features = ["json", "env-filter"] }
 anyhow = "1.0.100"
 serde = { version = "1.0.228", features = ["derive"] }
 k8s-openapi = { version = "0.27.0", features = ["latest"] }
-git2 = "0.20.3"
+git2 = "0.20.4"
 serde_yaml = "0.9.34"
 base64 = "0.22.1"
 tracing-bunyan-formatter = "0.3.10"