build(deps): bump gix from 0.48.0 to 0.51.0

Bumps [gix](https://github.com/Byron/gitoxide) from 0.48.0 to 0.51.0.
- [Release notes](https://github.com/Byron/gitoxide/releases)
- [Changelog](https://github.com/Byron/gitoxide/blob/main/CHANGELOG.md)
- [Commits](https://github.com/Byron/gitoxide/compare/gix-v0.48.0...gix-v0.51.0)

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

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

helix-vcs/Cargo.toml

@@ -18,7 +18,7 @@ tokio = { version = "1", features = ["rt", "rt-multi-thread", "time", "sync", "p
 parking_lot = "0.12"
 arc-swap = { version = "1.6.0" }
 
-gix = { version = "0.48.0", default-features = false , optional = true }
+gix = { version = "0.55.0", default-features = false , optional = true }
 imara-diff = "0.1.5"
 anyhow = "1"