Bump tensorflow-gpu from 1.15.0 to 2.12.0 in /examples/benchmarks/TFT

Bumps [tensorflow-gpu](https://github.com/tensorflow/tensorflow) from 1.15.0 to 2.12.0.
- [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/v1.15.0...v2.12.0)

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

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examples/benchmarks/TFT/requirements.txt

@@ -1,2 +1,2 @@
-tensorflow-gpu==1.15.0
+tensorflow-gpu==2.12.0
 pandas==1.1.0