Bump tensorflow from 2.2.0 to 2.2.1 in /cvat/requirements (#2228)

Bumps [tensorflow](https://github.com/tensorflow/tensorflow) from 2.2.0 to 2.2.1.
- [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/v2.2.0...v2.2.1)
Signed-off-by: Ndependabot[bot] <support@github.com>
Co-authored-by: Ndependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

cvat/requirements/base.txt

@@ -39,7 +39,7 @@ h5py==2.10.0
 django-cors-headers==3.5.0
 furl==2.1.0
 av==8.0.2 --no-binary=av
-tensorflow==2.2.0 # Optional requirement of Datumaro
+tensorflow==2.2.1 # Optional requirement of Datumaro
 # The package is used by pyunpack as a command line tool to support multiple
 # archives. Don't use as a python module because it has GPL license.
 patool==1.12