Bump tensorflow from 2.7.0 to 2.8.0 in /cmd/suggestion/nas/enas/v1bet…

…a1 (#1806)

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](tensorflow/tensorflow@v2.7.0...v2.8.0)

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

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cmd/suggestion/nas/enas/v1beta1/requirements.txt

@@ -1,5 +1,5 @@
 grpcio==1.41.1
 protobuf==3.19.1
 googleapis-common-protos==1.6.0
-tensorflow==2.7.0
+tensorflow==2.8.0
 cython>=0.29.24