Bump tensorflow from 2.6.0 to 2.7.0 (#53)

Bumps [tensorflow](https://github.com/tensorflow/tensorflow) from 2.6.0 to 2.7.0.
- [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/v2.6.0...v2.7.0)

---
updated-dependencies:
- dependency-name: tensorflow
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -1,7 +1,7 @@
 numpy==1.19.5
 opencv-contrib-python-headless==4.1.2.30
 scipy==1.7.1
-tensorflow==2.6.0
+tensorflow==2.6.1
 colorama==0.4.4
 tqdm==4.62.3
 ffmpeg-python==0.2.0

requirements_3.6.txt

@@ -1,7 +1,7 @@
 numpy==1.19.2
 opencv-contrib-python-headless==4.1.2.30
 scipy==1.5.4
-tensorflow==2.6.0
+tensorflow==2.6.1
 colorama==0.4.4
 tqdm==4.62.3
 ffmpeg-python==0.2.0

requirements_3.9.txt

@@ -1,7 +1,7 @@
 numpy==1.19.5
 opencv-contrib-python-headless==4.5.1.48
 scipy==1.7.1
-tensorflow==2.6.0
+tensorflow==2.6.1
 colorama==0.4.4
 tqdm==4.62.3
 ffmpeg-python==0.2.0