Bump tensorflow from 1.10.0 to 2.4.2

Bumps [tensorflow](https://github.com/tensorflow/tensorflow) from 1.10.0 to 2.4.2.
- [Release notes](https://github.com/tensorflow/tensorflow/releases)
- [Changelog](https://github.com/tensorflow/tensorflow/blob/master/RELEASE.md)
- [Commits](tensorflow/tensorflow@v1.10.0...v2.4.2)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements.txt

@@ -6,6 +6,6 @@ scipy==1.5.4
 GPy==1.9.9
 ipympl==0.6.3
 keras==2.2.2
-tensorflow==1.10.0
+tensorflow==2.4.2
 seaborn==0.11.0
 voila