Update yoast/phpunit-polyfills requirement from ^3.0.0 to ^3.1.1

Updates the requirements on [yoast/phpunit-polyfills](https://github.com/Yoast/PHPUnit-Polyfills) to permit the latest version.
- [Release notes](https://github.com/Yoast/PHPUnit-Polyfills/releases)
- [Changelog](https://github.com/Yoast/PHPUnit-Polyfills/blob/3.x/CHANGELOG.md)
- [Commits](Yoast/PHPUnit-Polyfills@3.0.0...3.1.1)

---
updated-dependencies:
- dependency-name: yoast/phpunit-polyfills
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

composer.json

@@ -20,7 +20,7 @@
 		"johnbillion/query-monitor": "^3.17.0",
 		"altis/dev-tools-command": "^0.8.1",
 		"wp-phpunit/wp-phpunit": "6.7.0",
-		"yoast/phpunit-polyfills": "^3.0.0",
+		"yoast/phpunit-polyfills": "^3.1.1",
 		"phpunit/phpunit": "~9.6",
 		"lucatume/wp-browser": "~4.4.1",
 		"codeception/module-asserts": "~3.0",