Bump tensorflow from 2.0.3 to 2.11.1

Bumps [tensorflow](https://github.com/tensorflow/tensorflow) from 2.0.3 to 2.11.1.
- [Release notes](https://github.com/tensorflow/tensorflow/releases)
- [Changelog](https://github.com/tensorflow/tensorflow/blob/master/RELEASE.md)
- [Commits](tensorflow/tensorflow@v2.0.3...v2.11.1)

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

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

requirements.txt

@@ -21,7 +21,7 @@ sklearn
 # Use TensorFlow v. 2.0 CPU because v. 2.1 is a 420 MB download!
 # Use v. 2.0.1 because of a security risk/warning in v. 2.0.0
 # https://github.com/tensorflow/tensorflow/releases/tag/v2.0.1
-tensorflow==2.0.3
+tensorflow==2.11.1
 
 ################################################################
 # Install the nbval package if you want to automatically