Bump mlflow from 2.3.1 to 2.5.0 in /dpsdgym (#567)

Bumps [mlflow](https://github.com/mlflow/mlflow) from 2.3.1 to 2.5.0.
- [Release notes](https://github.com/mlflow/mlflow/releases)
- [Changelog](https://github.com/mlflow/mlflow/blob/master/CHANGELOG.md)
- [Commits](mlflow/mlflow@v2.3.1...v2.5.0)

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

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dpsdgym/requirements.txt

@@ -1,7 +1,7 @@
 pyemd
 imblearn
 scipy
-mlflow==2.3.1
+mlflow==2.5.0
 diffprivlib
 pandas==0.25.3
 opacus