chore: bump phpstan to minimum 2.1.19 (bugfix)

Author: justlevine

composer.json

@@ -23,7 +23,7 @@
 		"squizlabs/php_codesniffer": "3.13.2",
 		"wp-coding-standards/wpcs": "~3.2.0",
 		"phpcompatibility/phpcompatibility-wp": "~2.1.3",
-		"phpstan/phpstan": "~2.1.17",
+		"phpstan/phpstan": "~2.1.19",
 		"yoast/phpunit-polyfills": "^1.1.0"
 	},
 	"config": {