Bump yoast/phpunit-polyfills from 1.0.2 to 1.0.3

Bumps [yoast/phpunit-polyfills](https://github.com/Yoast/PHPUnit-Polyfills) from 1.0.2 to 1.0.3.
- [Release notes](https://github.com/Yoast/PHPUnit-Polyfills/releases)
- [Changelog](https://github.com/Yoast/PHPUnit-Polyfills/blob/develop/CHANGELOG.md)
- [Commits](Yoast/PHPUnit-Polyfills@1.0.2...1.0.3)

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

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