Bump yoast/phpunit-polyfills from 1.1.0 to 3.1.1

Bumps [yoast/phpunit-polyfills](https://github.com/Yoast/PHPUnit-Polyfills) from 1.1.0 to 3.1.1.
- [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@1.1.0...3.1.1)

---
updated-dependencies:
- dependency-name: yoast/phpunit-polyfills
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

composer.json

@@ -12,7 +12,7 @@
     "wp-coding-standards/wpcs": "^2.3",
     "johnpbloch/wordpress-core": "6.1.1",
     "wp-phpunit/wp-phpunit": "6.1.1",
-    "yoast/phpunit-polyfills": "1.1.0",
+    "yoast/phpunit-polyfills": "3.1.1",
     "wp-cli/wp-cli": "*"
   },
   "config": {