Update lightning requirement from <2.3.0,>=1.8.6 to >=2.3.1,<2.4.0 in /requirements

[dependabot[bot]]

Updates the requirements on lightning to permit the latest version.

Release notes

Sourced from 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)
• a42484c Fix failing app tests (#19971)
• f6fd046 Release 2.3.0 (#19954)
• a97814a Update README.md
• fa5da26 Update README.md (#19968)
• 06ea3a0 Fix resetting epoch loop restarting flag in LearningRateFinder (#19819)
• 5fa32d9 Ignore parameters causing ValueError when dumping to YAML (#19804)
• 4f96c83 Sanitize argument-free object params before logging (#19771)
• a611de0 Removing numpy requirement from all files in examples/pytorch/domain_template...
• 812ffde Fix save_last type annotation for ModelCheckpoint (#19808)
• Additional commits viewable in compare view

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[dependabot[bot]]

The following labels could not be found: ci.

[dependabot[bot]]

Superseded by #185.