Build(deps): bump phpmd/phpmd from 2.12.0 to 2.13.0 in /.dev-tools

Bumps [phpmd/phpmd](https://github.com/phpmd/phpmd) from 2.12.0 to 2.13.0.
- [Release notes](https://github.com/phpmd/phpmd/releases)
- [Changelog](https://github.com/phpmd/phpmd/blob/master/CHANGELOG)
- [Commits](phpmd/phpmd@2.12.0...2.13.0)

---
updated-dependencies:
- dependency-name: phpmd/phpmd
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.dev-tools/composer.json

@@ -6,7 +6,7 @@
         "kubawerlos/php-cs-fixer-config": "^3.12.0",
         "maglnet/composer-require-checker": "^4.2.0",
         "mi-schi/phpmd-extension": "^4.3.0",
-        "phpmd/phpmd": "^2.12.0",
+        "phpmd/phpmd": "^2.13.0",
         "phpstan/extension-installer": "^1.1.0",
         "phpstan/phpstan": "^1.8.3",
         "phpstan/phpstan-phpunit": "^1.1.1",