build(deps): bump nextcloud/openapi-extractor

Bumps [nextcloud/openapi-extractor](https://github.com/nextcloud-releases/openapi-extractor) from 1.8.6 to 1.8.7.
- [Changelog](https://github.com/nextcloud-releases/openapi-extractor/blob/main/CHANGELOG.md)
- [Commits](nextcloud-releases/openapi-extractor@v1.8.6...v1.8.7)

---
updated-dependencies:
- dependency-name: nextcloud/openapi-extractor
  dependency-version: 1.8.7
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]