Bump tensorflow-gpu from 1.10.1 to 2.5.1

Bumps [tensorflow-gpu](https://github.com/tensorflow/tensorflow) from 1.10.1 to 2.5.1.
- [Release notes](https://github.com/tensorflow/tensorflow/releases)
- [Changelog](https://github.com/tensorflow/tensorflow/blob/master/RELEASE.md)
- [Commits](tensorflow/tensorflow@v1.10.1...v2.5.1)

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

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

Author: dependabot[bot]

requirements-gpu.txt

@@ -29,6 +29,6 @@ scipy==1.1.0
 six==1.11.0
 subprocess32==3.5.2
 tensorboard==1.10.0
-tensorflow-gpu==1.10.1
+tensorflow-gpu==2.5.1
 termcolor==1.1.0
 Werkzeug==0.14.1