Bump tensorflow from 2.11.1 to 2.12.1 in /.devcontainer

Bumps [tensorflow](https://github.com/tensorflow/tensorflow) from 2.11.1 to 2.12.1.
- [Release notes](https://github.com/tensorflow/tensorflow/releases)
- [Changelog](https://github.com/tensorflow/tensorflow/blob/master/RELEASE.md)
- [Commits](tensorflow/tensorflow@v2.11.1...v2.12.1)

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

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

.devcontainer/requirements.txt

@@ -14,7 +14,7 @@ tensorboard-data-server==0.6.1
 tensorflow-datasets==4.4.0
 tensorflow-hub==0.12.0
 tensorflow-text==2.8.1
-tensorflow==2.11.1
+tensorflow==2.12.1
 tensorboard==2.8.0
 tokenizers==0.13.3
 torchinfo==0.0.8