MC-39901: Stabilize Web-API tests

- Fix phpstan version

Author: eliseacornejo

composer.json

@@ -93,7 +93,7 @@
         "pdepend/pdepend": "~2.7.1",
         "phpcompatibility/php-compatibility": "^9.3",
         "phpmd/phpmd": "@stable",
-        "phpstan/phpstan": "^0.12.2",
+        "phpstan/phpstan": ">=0.12.3 <=0.12.23",
         "phpunit/phpunit": "^9",
         "sebastian/phpcpd": "~5.0.0",
         "squizlabs/php_codesniffer": "~3.5.4"