Bump phpstan/phpstan from 1.8.8 to 1.8.9 (#5341)

Bumps [phpstan/phpstan](https://github.com/phpstan/phpstan) from 1.8.8 to 1.8.9.
- [Release notes](https://github.com/phpstan/phpstan/releases)
- [Changelog](https://github.com/phpstan/phpstan/blob/1.9.x/CHANGELOG.md)
- [Commits](https://github.com/phpstan/phpstan/compare/1.8.8...1.8.9)

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

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

composer.json

@@ -53,7 +53,7 @@
       "webmozart/path-util": "^2.3"
    },
    "require-dev": {
-      "phpstan/phpstan": "1.8.8",
+      "phpstan/phpstan": "1.8.9",
       "phpstan/phpstan-phpunit": "^1.1.0",
       "phpstan/phpstan-strict-rules": "^1.2.0",
       "phpunit/phpunit": "^9.2"