Bump phpunit/php-code-coverage from 9.2.19 to 9.2.21 (#88)

Bumps [phpunit/php-code-coverage](https://github.com/sebastianbergmann/php-code-coverage) from 9.2.19 to 9.2.21.
- [Release notes](https://github.com/sebastianbergmann/php-code-coverage/releases)
- [Changelog](https://github.com/sebastianbergmann/php-code-coverage/blob/main/ChangeLog.md)
- [Commits](sebastianbergmann/php-code-coverage@9.2.19...9.2.21)

---
updated-dependencies:
- dependency-name: phpunit/php-code-coverage
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]