Bump mlflow from 2.1.1 to 2.3.1 in /mlflow

Bumps [mlflow](https://github.com/mlflow/mlflow) from 2.1.1 to 2.3.1.
- [Release notes](https://github.com/mlflow/mlflow/releases)
- [Changelog](https://github.com/mlflow/mlflow/blob/master/CHANGELOG.md)
- [Commits](mlflow/mlflow@v2.1.1...v2.3.1)

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

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

Author: dependabot[bot]

mlflow/requirements.txt

@@ -1,4 +1,4 @@
-mlflow==2.1.1
+mlflow==2.3.1
 protobuf==4.21.12
 psycopg2-binary==2.9.5
 PyMySQL==1.0.2