build(deps): bump tensorflow-gpu in /Traffic-Sign-Detection

Bumps [tensorflow-gpu](https://github.com/tensorflow/tensorflow) from 2.6.4 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@v2.6.4...v2.7.2)

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

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

Author: dependabot[bot]

Traffic-Sign-Detection/requirements.txt

@@ -106,7 +106,7 @@ tensorboard==2.4.1
 tensorboard-plugin-wit==1.7.0
 tensorflow==2.7.2
 tensorflow-estimator==2.4.0
-tensorflow-gpu==2.6.4
+tensorflow-gpu==2.7.2
 termcolor==1.1.0
 terminado==0.9.2
 testpath==0.4.4