Bump yoast/phpunit-polyfills from 1.0.5 to 2.0.0 (#130)

Bumps [yoast/phpunit-polyfills](https://github.com/Yoast/PHPUnit-Polyfills) from 1.0.5 to 2.0.0.
- [Release notes](https://github.com/Yoast/PHPUnit-Polyfills/releases)
- [Changelog](https://github.com/Yoast/PHPUnit-Polyfills/blob/2.x/CHANGELOG.md)
- [Commits](Yoast/PHPUnit-Polyfills@1.0.5...2.0.0)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

composer.json

@@ -17,7 +17,7 @@
         "pantheon-systems/pantheon-wordpress-upstream-tests": "dev-master",
         "pantheon-systems/pantheon-wp-coding-standards": "^1.0.0",
         "phpunit/phpunit": "^9",
-        "yoast/phpunit-polyfills": "^1.0",
+        "yoast/phpunit-polyfills": "^2.0",
         "symfony/yaml": "^5.4 || ^6"
     },
     "autoload-dev": {