Bump phpmd/phpmd from 2.8.2 to 2.9.1 (#229)

Bumps [phpmd/phpmd](https://github.com/phpmd/phpmd) from 2.8.2 to 2.9.1.
- [Release notes](https://github.com/phpmd/phpmd/releases)
- [Changelog](https://github.com/phpmd/phpmd/blob/master/CHANGELOG)
- [Commits](phpmd/phpmd@2.8.2...2.9.1)

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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

composer.json

@@ -28,7 +28,7 @@
         "ergebnis/composer-normalize": "^2.8",
         "friendsofphp/php-cs-fixer": "^2.16",
         "infection/infection": "^0.20.1",
-        "phpmd/phpmd": "~2.8.0",
+        "phpmd/phpmd": "~2.9.1",
         "phpunit/phpunit": "^9",
         "vimeo/psalm": "^4.4.1"
     },