Bump tensorflow in /examples/research_projects/decision_transformer (#17400)
Bumps [tensorflow](https://github.com/tensorflow/tensorflow) from 2.8.0 to 2.8.1.
- [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/v2.8.0...v2.8.1)
---
updated-dependencies:
- dependency-name: tensorflow
dependency-type: direct:production
...
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