build(deps-dev): bump pytorch-lightning from 2.3.0 to 2.3.1 in /runtimes/mlflow

[dependabot[bot]]

Bumps pytorch-lightning from 2.3.0 to 2.3.1.

Release notes

Sourced from pytorch-lightning's releases.

Patch release v2.3.1

Includes minor bugfixes and stability improvements.

Full Changelog: https://github.com/Lightning-AI/pytorch-lightning/compare/2.3.0...2.3.1

Commits

• 8b69285 Patch release 2.3.1 (#20021)
• See full diff in compare view

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