Bump tensorflow from 1.15.2 to 2.7.2 in /hyperlpr_py3

Bumps [tensorflow](https://github.com/tensorflow/tensorflow) from 1.15.2 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/v1.15.2...v2.7.2)

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

Signed-off-by: dependabot[bot] <support@github.com>

hyperlpr_py3/requirements.txt

@@ -46,7 +46,7 @@ six==1.14.0
 sklearn==0.0
 SQLAlchemy==1.3.15
 tensorboard==1.13.1
-tensorflow==1.15.2
+tensorflow==2.7.2
 tensorflow-estimator==1.13.0
 termcolor==1.1.0
 Theano==1.0.4