chore(deps): update dependency ergebnis/phpstan-rules to ^2.6.1

Author: renovate[bot]

composer.json

@@ -15,7 +15,7 @@
     },
     "require-dev": {
         "ergebnis/composer-normalize": "^2.43.0",
-        "ergebnis/phpstan-rules": "^2.5.0",
+        "ergebnis/phpstan-rules": "^2.6.1",
         "lendable/composer-license-checker": "^1.2.1",
         "lendable/phpunit-extensions": "^0.3",
         "php-cs-fixer/shim": "^3.60.0",