ci(deps-dev): Bump nextcloud/rector in /vendor-bin/rector

Bumps [nextcloud/rector](https://github.com/nextcloud-libraries/rector) from 0.2.1 to 0.3.1.
- [Changelog](https://github.com/nextcloud-libraries/rector/blob/main/CHANGELOG.md)
- [Commits](nextcloud-libraries/rector@v0.2.1...v0.3.1)

---
updated-dependencies:
- dependency-name: nextcloud/rector
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

vendor-bin/rector/composer.json

@@ -1,6 +1,6 @@
 {
     "require-dev": {
         "rector/rector": "^2.0.8",
-        "nextcloud/rector": "^0.2.1"
+        "nextcloud/rector": "^0.3.1"
     }
 }