Bump tensorflow from 2.7.0 to 2.7.2 in /docs/requirements (#74)

Bumps [tensorflow](https://github.com/tensorflow/tensorflow) from 2.7.0 to 2.7.2.
- [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/v2.7.0...v2.7.2)

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

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

docs/requirements/openvino_requirements.txt

@@ -1,4 +1,4 @@
-tensorflow>=1.2.0,<2.0.0
+tensorflow>=1.2.0,<3.0.0
 networkx==2.3.0
 numpy>=1.12.0
 test-generator==0.1.1

docs/requirements/requirements_builder.txt

@@ -1,4 +1,4 @@
-tensorflow==2.7.0
+tensorflow==2.7.2
 # torch==1.10.0
 serial
 pure-python-adb