Bump pytorch-lightning from 2.0.7 to 2.0.8 (#155)

Bumps [pytorch-lightning](https://github.com/Lightning-AI/lightning) from 2.0.7 to 2.0.8.
- [Release notes](https://github.com/Lightning-AI/lightning/releases)
- [Commits](Lightning-AI/pytorch-lightning@2.0.7...2.0.8)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -1,6 +1,6 @@
 dgl==1.1.2
 torch==2.0.1
-pytorch_lightning==2.0.7
+pytorch_lightning==2.0.8
 pymatgen==2023.8.10
 ase==3.22.1
 boto3