[tune](deps): Bump pytorch-lightning in /python/requirements

Bumps [pytorch-lightning](https://github.com/PyTorchLightning/pytorch-lightning) from 1.0.3 to 1.3.8.
- [Release notes](https://github.com/PyTorchLightning/pytorch-lightning/releases)
- [Changelog](https://github.com/PyTorchLightning/pytorch-lightning/blob/master/CHANGELOG.md)
- [Commits](Lightning-AI/pytorch-lightning@1.0.3...1.3.8)

---
updated-dependencies:
- dependency-name: pytorch-lightning
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

python/requirements/ml/requirements_tune.txt

@@ -29,7 +29,7 @@ nevergrad==0.4.3.post7
 optuna==2.9.1
 pytest-remotedata==0.3.2
 lightning-bolts==0.4.0
-pytorch-lightning==1.4.5
+pytorch-lightning==1.4.8
 scikit-learn==0.24.2
 scikit-optimize==0.8.1
 sigopt==7.5.0