build(deps): bump mlflow from 2.20.4 to 3.1.1 in /runtimes/mlflow

Bumps [mlflow](https://github.com/mlflow/mlflow) from 2.20.4 to 3.1.1.
- [Release notes](https://github.com/mlflow/mlflow/releases)
- [Changelog](https://github.com/mlflow/mlflow/blob/master/CHANGELOG.md)
- [Commits](mlflow/mlflow@v2.20.4...v3.1.1)

---
updated-dependencies:
- dependency-name: mlflow
  dependency-version: 3.1.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Author: dependabot[bot]