Bump tensorflow (microsoft#113)

Bumps [tensorflow](https://github.com/tensorflow/tensorflow) from 2.6.3 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@v2.6.3...v2.7.2)

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

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

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

Author: dependabot[bot]

mobile/examples/object_detection/ios/ORTObjectDetection/prepare_model.requirements.txt

@@ -1,5 +1,5 @@
 onnx==1.10.0
 onnxruntime==1.10.0
 protobuf==3.20.1
-tensorflow==2.6.3
+tensorflow==2.7.2
 tf2onnx==1.9.3