Update phpstan version (#2015)

Author: tmotyl

composer.json

@@ -11,8 +11,8 @@
     "magento-hackathon/magento-composer-installer": "^3.1 || ^2.1 || ^4.0"
   },
   "require-dev": {
-    "macopedia/phpstan-magento1": "^1.0",
-    "phpstan/phpstan": "^0.12"
+    "macopedia/phpstan-magento1": "^1.0.2",
+    "phpstan/phpstan": "^1.4.6"
   },
   "authors": [
     {