Bump nelmio/api-doc-bundle from 4.16.2 to 4.18.1

Bumps [nelmio/api-doc-bundle](https://github.com/nelmio/NelmioApiDocBundle) from 4.16.2 to 4.18.1.
- [Release notes](https://github.com/nelmio/NelmioApiDocBundle/releases)
- [Changelog](https://github.com/nelmio/NelmioApiDocBundle/blob/master/CHANGELOG.md)
- [Commits](nelmio/NelmioApiDocBundle@v4.16.2...v4.18.1)

---
updated-dependencies:
- dependency-name: nelmio/api-doc-bundle
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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