Merge pull request #1856 from WordPress/dependabot/composer/yoast/phpunit-polyfills-4.0.0

Bump yoast/phpunit-polyfills from 3.1.1 to 4.0.0

Author: westonruter

composer.json

@@ -30,7 +30,7 @@
     "szepeviktor/phpstan-wordpress": "^1.3",
     "wp-coding-standards/wpcs": "^3.1",
     "wp-phpunit/wp-phpunit": "^6.5",
-    "yoast/phpunit-polyfills": "^3.1",
+    "yoast/phpunit-polyfills": "^4.0",
     "phpstan/php-8-stubs": "^0.4.0",
     "phpstan/phpstan-strict-rules": "^1.6"
   },