Bump tensorflow from 1.14.0 to 2.7.2 in /packages

Bumps [tensorflow](https://github.com/tensorflow/tensorflow) from 1.14.0 to 2.7.2.
- [Release notes](https://github.com/tensorflow/tensorflow/releases)
- [Changelog](https://github.com/tensorflow/tensorflow/blob/master/RELEASE.md)
- [Commits](tensorflow/tensorflow@v1.14.0...v2.7.2)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

packages/requirements-cpu-ubuntu20.04_py38.txt

@@ -1,4 +1,4 @@
-tensorflow==2.2.0
+tensorflow==2.7.2
 torch==1.9.0
 torchvision==0.10.0
 mxnet==1.5.0

packages/requirements-cpu.txt

@@ -1,4 +1,4 @@
-tensorflow==1.14.0
+tensorflow==2.7.2
 torch==1.9.0
 torchvision==0.10.0
 mxnet==1.5.0