Add back phpstan

Author: olssonm

composer.json

@@ -15,8 +15,9 @@
     },
     "require-dev": {
         "orchestra/testbench": ">=6.15",
-        "squizlabs/php_codesniffer": "^3.5",
-        "phpunit/phpunit": "*"
+        "phpstan/phpstan": "^2.0",
+        "phpunit/phpunit": "*",
+        "squizlabs/php_codesniffer": "^3.5"
     },
     "autoload": {
         "psr-4": {