Bump pytorch-lightning from 2.1.3 to 2.1.4

Bumps [pytorch-lightning](https://github.com/Lightning-AI/lightning) from 2.1.3 to 2.1.4.
- [Release notes](https://github.com/Lightning-AI/lightning/releases)
- [Commits](Lightning-AI/pytorch-lightning@2.1.3...2.1.4)

---
updated-dependencies:
- dependency-name: pytorch-lightning
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>