Allow PHPStan 1.6

Author: mglaman

composer.json

@@ -12,7 +12,7 @@
     "require": {
         "php": "^7.4 || ^8.0",
         "symfony/finder": "~3.4.5 ||^4.2 || ^5.0 || ^6.0",
-        "phpstan/phpstan": "^1.7.0",
+        "phpstan/phpstan": "^1.6.0",
         "symfony/yaml": "~3.4.5 || ^4.2|| ^5.0 || ^6.0",
         "webflo/drupal-finder": "^1.2"
     },