chore(deps): bump gix from 0.80.0 to 0.81.0 in /robot-repo-automaton (#24)

Bumps [gix](https://github.com/GitoxideLabs/gitoxide) from 0.80.0 to 0.81.0.
- [Release notes](https://github.com/GitoxideLabs/gitoxide/releases)
- [Changelog](https://github.com/GitoxideLabs/gitoxide/blob/main/CHANGELOG.md)
- [Commits](GitoxideLabs/gitoxide@gix-v0.80.0...gix-v0.81.0)

---
updated-dependencies:
- dependency-name: gix
  dependency-version: 0.81.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

robot-repo-automaton/Cargo.lock

@@ -47,7 +47,7 @@ toml = "0.8"
 # Git operations
 # Using vendored-openssl to avoid system OpenSSL dependency (libssl-dev)
 git2 = { version = "0.20", features = ["vendored-openssl"], default-features = false }
-gix = { version = "0.80", features = ["blocking-http-transport-reqwest-rust-tls"] }
+gix = { version = "0.81", features = ["blocking-http-transport-reqwest-rust-tls"] }
 
 # S-expression parsing (for ERROR-CATALOG.scm)
 lexpr = "0.2"