Bump tensorflow from 2.5.3 to 2.6.4 in /object/detection/src

Bumps [tensorflow](https://github.com/tensorflow/tensorflow) from 2.5.3 to 2.6.4.
- [Release notes](https://github.com/tensorflow/tensorflow/releases)
- [Changelog](https://github.com/tensorflow/tensorflow/blob/master/RELEASE.md)
- [Commits](tensorflow/tensorflow@v2.5.3...v2.6.4)

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

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

Author: dependabot[bot]

object/detection/src/requirements.txt

@@ -1,4 +1,4 @@
-tensorflow==2.5.3
+tensorflow==2.6.4
 keras==2.4.3
 numpy==1.21.0
 pillow==9.0.1