[TASK] Update phpstan/phpstan to v2.1.31 (#144)

| datasource | package         | from   | to     |
| ---------- | --------------- | ------ | ------ |
| packagist  | phpstan/phpstan | 2.1.30 | 2.1.31 |

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

Tests/CGL/composer.json

@@ -4,7 +4,7 @@
 		"ergebnis/composer-normalize": "2.48.2",
 		"friendsofphp/php-cs-fixer": "3.88.2",
 		"phpstan/extension-installer": "1.4.3",
-		"phpstan/phpstan": "2.1.30",
+		"phpstan/phpstan": "2.1.31",
 		"phpstan/phpstan-phpunit": "2.0.7",
 		"phpstan/phpstan-symfony": "2.0.8",
 		"saschaegerer/phpstan-typo3": "2.1.1",