Bump apache-beam[gcp] from 2.28.0 to 2.29.0 (#336)

* Bump apache-beam[gcp] from 2.28.0 to 2.29.0

Bumps [apache-beam[gcp]](https://github.com/apache/beam) from 2.28.0 to 2.29.0.
- [Release notes](https://github.com/apache/beam/releases)
- [Changelog](https://github.com/apache/beam/blob/master/CHANGES.md)
- [Commits](https://github.com/apache/beam/compare/v2.28.0...v2.29.0

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

* replaced mock with unittest.mock

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
Co-authored-by: Daniel Ecer <de-code@users.noreply.github.com>