chore(deps): bump tensorflow (GoogleCloudPlatform#7503)

Bumps [tensorflow](https://github.com/tensorflow/tensorflow) from 2.7.1 to 2.8.0.
- [Release notes](https://github.com/tensorflow/tensorflow/releases)
- [Changelog](https://github.com/tensorflow/tensorflow/blob/master/RELEASE.md)
- [Commits](tensorflow/tensorflow@v2.7.1...v2.8.0)

---
updated-dependencies:
- dependency-name: tensorflow
  dependency-type: direct:production
...

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

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

Author: dependabot[bot]

people-and-planet-ai/timeseries-classification/requirements.txt

@@ -3,4 +3,4 @@ apache-beam[gcp]==2.35.0
 google-cloud-aiplatform==1.10.0
 gunicorn==20.1.0
 pandas==1.3.5
-tensorflow==2.7.1
+tensorflow==2.8.0