Fixed constraint for phpstan/phpstan according to reviewer request

Author: andrewbess

composer.json

@@ -90,7 +90,7 @@
         "pdepend/pdepend": "~2.10.0",
         "phpcompatibility/php-compatibility": "^9.3",
         "phpmd/phpmd": "^2.9.1",
-        "phpstan/phpstan": "^1.1",
+        "phpstan/phpstan": "~1.1.0",
         "phpunit/phpunit": "~9.5.0",
         "sebastian/phpcpd": "^6.0.3",
         "squizlabs/php_codesniffer": "~3.6.0",