composer(deps-dev): Bump rector/rector from 0.15.11 to 0.15.12

Bumps [rector/rector](https://github.com/rectorphp/rector) from 0.15.11 to 0.15.12.
- [Release notes](https://github.com/rectorphp/rector/releases)
- [Commits](rectorphp/rector@0.15.11...0.15.12)

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

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

composer.json

@@ -26,7 +26,7 @@
     "infection/infection": "~0.26.19",
     "phpunit/phpunit": "^9.6.0",
     "psalm/plugin-phpunit": "~0.18.4",
-    "rector/rector": "~0.15.11",
+    "rector/rector": "~0.15.12",
     "symfony/filesystem": "^5.0.0 || ^6.0.0",
     "symfony/process": "^5.0.0 || ^6.0.0",
     "vimeo/psalm": "^5.6.0"