Bump m4tthumphrey/php-gitlab-api from 11.9.0 to 11.11.0

Bumps [m4tthumphrey/php-gitlab-api](https://github.com/GitLabPHP/Client) from 11.9.0 to 11.11.0.
- [Release notes](https://github.com/GitLabPHP/Client/releases)
- [Changelog](https://github.com/GitLabPHP/Client/blob/11.11/CHANGELOG.md)
- [Commits](GitLabPHP/Client@11.9.0...11.11.0)

---
updated-dependencies:
- dependency-name: m4tthumphrey/php-gitlab-api
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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