Bump the dependencies group with 3 updates

Bumps the dependencies group with 3 updates: [google/cloud-firestore](https://github.com/googleapis/google-cloud-php-firestore), [google/cloud-pubsub](https://github.com/googleapis/google-cloud-php-pubsub) and [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit).


Updates `google/cloud-firestore` from 1.42.0 to 1.43.0
- [Release notes](https://github.com/googleapis/google-cloud-php-firestore/releases)
- [Commits](googleapis/google-cloud-php-firestore@v1.42.0...v1.43.0)

Updates `google/cloud-pubsub` from 2.0.0 to 2.1.0
- [Release notes](https://github.com/googleapis/google-cloud-php-pubsub/releases)
- [Commits](googleapis/google-cloud-php-pubsub@v2.0.0...v2.1.0)

Updates `phpunit/phpunit` from 11.1.0 to 11.1.2
- [Release notes](https://github.com/sebastianbergmann/phpunit/releases)
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/11.1.2/ChangeLog-11.1.md)
- [Commits](sebastianbergmann/phpunit@11.1.0...11.1.2)

---
updated-dependencies:
- dependency-name: google/cloud-firestore
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: dependencies
- dependency-name: google/cloud-pubsub
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: dependencies
- dependency-name: phpunit/phpunit
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: dependencies
...

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