chore(deps): update dependency vimeo/psalm to v5.21.0

Author: renovate[bot]

php/composer.json

@@ -19,7 +19,7 @@
     },
     "require-dev": {
         "phpunit/phpunit": "^10.0",
-        "vimeo/psalm": "5.19.1",
+        "vimeo/psalm": "5.21.0",
         "friendsofphp/php-cs-fixer": "^3.5",
         "psalm/plugin-phpunit": "^0.18.0",
         "nikic/php-parser": "^4.14"