build(deps): bump git2 from 0.17.0 to 0.18.0

Bumps [git2](https://github.com/rust-lang/git2-rs) from 0.17.0 to 0.18.0.
- [Changelog](https://github.com/rust-lang/git2-rs/blob/master/CHANGELOG.md)
- [Commits](rust-lang/git2-rs@git2-curl-0.17.0...git2-0.18.0)

---
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

@@ -22,7 +22,7 @@ env_logger = "0.10.0"
 thiserror = "1"
 anyhow = "1"
 flate2 = "1.0.24"
-git2 = "0.17.0"
+git2 = "0.18.0"
 log = "0.4"
 pbr = "1.1.1"
 reqwest = { version = "0.11.12", features = ["blocking", "json"] }