build(deps): bump tensorflow from 2.2.0 to 2.4.2

Bumps [tensorflow](https://github.com/tensorflow/tensorflow) from 2.2.0 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@v2.2.0...v2.4.2)

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

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Author: dependabot[bot]

requirements.txt

@@ -2,7 +2,7 @@ click == 7.1.2
 opencv-python == 4.1.2.30
 requests == 2.24.0
 shapely == 1.7.1
-tensorflow == 2.2.0
+tensorflow == 2.4.2
 tqdm == 4.45.0
 numpy == 1.17.4
 pyyaml == 5.4