Bump the gix group with 2 updates (#1249)

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


Updates `gix-features` from 0.36.1 to 0.37.1
- [Release notes](https://github.com/Byron/gitoxide/releases)
- [Changelog](https://github.com/Byron/gitoxide/blob/main/CHANGELOG.md)
- [Commits](GitoxideLabs/gitoxide@gix-features-v0.36.1...gix-features-v0.37.1)

Updates `gix-testtools` from 0.12.0 to 0.13.0

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]