Bump tensorflow from 2.7.0 to 2.8.0 (#2755)

Bumps [tensorflow](https://github.com/tensorflow/tensorflow) from 2.7.0 to 2.8.0.
- [Release notes](https://github.com/tensorflow/tensorflow/releases)
- [Changelog](https://github.com/tensorflow/tensorflow/blob/master/RELEASE.md)
- [Commits](https://github.com/tensorflow/tensorflow/compare/v2.7.0...v2.8.0)

---
updated-dependencies:
- dependency-name: tensorflow
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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