Bump pytorch-lightning from 1.2.5 to 1.2.6 (#30)

Bumps [pytorch-lightning](https://github.com/PyTorchLightning/pytorch-lightning) from 1.2.5 to 1.2.6.
- [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@1.2.5...1.2.6)

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

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

Author: dependabot[bot]

requirements-test.txt

@@ -3,7 +3,7 @@ flake8-comprehensions
 flake8-quotes==2.0.0
 yapf==0.23.0
 pytest
-pytorch-lightning==1.2.5
+pytorch-lightning==1.2.6
 lightning-bolts==0.3.2
 ray[tune]
 torchvision