Bump the gix group with 2 updates

Bumps the gix group with 2 updates: [gix](https://github.com/GitoxideLabs/gitoxide) and [gix-features](https://github.com/GitoxideLabs/gitoxide).


Updates `gix` from 0.67.0 to 0.68.0
- [Release notes](https://github.com/GitoxideLabs/gitoxide/releases)
- [Changelog](https://github.com/GitoxideLabs/gitoxide/blob/main/CHANGELOG.md)
- [Commits](GitoxideLabs/gitoxide@gix-v0.67.0...gix-v0.68.0)

Updates `gix-features` from 0.39.0 to 0.39.1
- [Release notes](https://github.com/GitoxideLabs/gitoxide/releases)
- [Changelog](https://github.com/GitoxideLabs/gitoxide/blob/main/CHANGELOG.md)
- [Commits](GitoxideLabs/gitoxide@gix-features-v0.39.0...gix-features-v0.39.1)

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

Signed-off-by: dependabot[bot] <[email protected]>