Build(deps-dev): bump phpmd/phpmd from 2.8.2 to 2.9.0 in /dev-tools

Bumps [phpmd/phpmd](https://github.com/phpmd/phpmd) from 2.8.2 to 2.9.0.
- [Release notes](https://github.com/phpmd/phpmd/releases)
- [Changelog](https://github.com/phpmd/phpmd/blob/master/CHANGELOG)
- [Commits](phpmd/phpmd@2.8.2...2.9.0)

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

dev-tools/composer.json

@@ -5,7 +5,7 @@
         "kubawerlos/php-cs-fixer-custom-fixers": "^2.3.0",
         "maglnet/composer-require-checker": "^2.1.0",
         "mi-schi/phpmd-extension": "^4.3.0",
-        "phpmd/phpmd": "^2.8.2",
+        "phpmd/phpmd": "^2.9.0",
         "phpstan/phpstan": "^0.12.40",
         "phpstan/phpstan-strict-rules": "^0.12.5",
         "squizlabs/php_codesniffer": "^3.5.6",