chore(deps): update dependency phpstan/phpstan to ~1.12.0

Author: renovate[bot]

providers/Flagsmith/composer.json

@@ -37,7 +37,7 @@
     "php-parallel-lint/php-console-highlighter": "^1.0",
     "php-parallel-lint/php-parallel-lint": "^1.3",
     "phpstan/extension-installer": "^1.1",
-    "phpstan/phpstan": "~1.10.0",
+    "phpstan/phpstan": "~1.12.0",
     "phpstan/phpstan-mockery": "^1.0",
     "phpstan/phpstan-phpunit": "^1.1",
     "phpunit/phpunit": "^9.6",