build(deps): bump pytorch-lightning in /tests/e2e

Bumps [pytorch-lightning](https://github.com/Lightning-AI/lightning) from 1.9.5 to 2.5.0.post0.
- [Release notes](https://github.com/Lightning-AI/lightning/releases)
- [Commits](Lightning-AI/pytorch-lightning@1.9.5...2.5.0.post0)

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

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

tests/e2e/mnist_pip_requirements.txt

@@ -1,4 +1,4 @@
-pytorch_lightning==1.9.5
+pytorch_lightning==2.5.0.post0
 torchmetrics==0.9.1
 torchvision==0.20.1
 minio