Bump pytorch-lightning from 1.3.5 to 1.3.8 (#48)

Bumps [pytorch-lightning](https://github.com/PyTorchLightning/pytorch-lightning) from 1.3.5 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@1.3.5...1.3.8)

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

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

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

Author: dependabot[bot]

poetry.lock

@@ -18,7 +18,7 @@ keywords = ["time-series", "machine-learning", "pytorch"]
 [tool.poetry.dependencies]
 python = ">=3.7,<3.10"
 torch = "^1.9.0"
-pytorch-lightning = "^1.3.5"
+pytorch-lightning = "^1.3.8"
 scipy = "^1.7.0"
 
 [tool.poetry.dev-dependencies]