Merge pull request #110 from php-school/update-phpstan

Update phpstan

Author: AydinHassan

composer.json

@@ -18,7 +18,7 @@
         "ext-sockets": "*"
     },
     "require-dev": {
-        "phpstan/phpstan": "^0.12.52",
+        "phpstan/phpstan": "^1.9",
         "squizlabs/php_codesniffer": "^3.5",
         "phpunit/phpunit": "^9.6"
     },