Bump tensorflow from 2.4.1 to 2.12.1 in /galaxy_mergers

Bumps [tensorflow](https://github.com/tensorflow/tensorflow) from 2.4.1 to 2.12.1.
- [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/v2.4.1...v2.12.1)

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

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

galaxy_mergers/requirements.txt

@@ -43,7 +43,7 @@ six==1.15.0
 tabulate==0.8.9
 tensorboard==2.4.1
 tensorboard-plugin-wit==1.8.0
-tensorflow==2.4.1
+tensorflow==2.12.1
 tensorflow-estimator==2.4.0
 tensorflow-probability==0.12.1
 termcolor==1.1.0