Bump keras from 2.4.3 to 2.13.1 in /Projects/AI project MNIST

Bumps [keras](https://github.com/keras-team/keras) from 2.4.3 to 2.13.1.
- [Release notes](https://github.com/keras-team/keras/releases)
- [Commits](https://github.com/keras-team/keras/commits/v2.13.1)

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

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Author: dependabot[bot]

Projects/AI project MNIST/requirements.txt

@@ -1,4 +1,4 @@
 opencv_python==4.5.2.52
 numpy==1.22.0
 keras_nightly==2.5.0.dev2021032900
-keras==2.4.3
+keras==2.13.1