build(deps): bump pytorch-lightning in /demo-notebooks/guided-demos

Bumps [pytorch-lightning](https://github.com/Lightning-AI/lightning) from 2.4.0 to 2.6.0.
- [Release notes](https://github.com/Lightning-AI/lightning/releases)
- [Commits](Lightning-AI/pytorch-lightning@2.4.0...2.6.0)

---
updated-dependencies:
- dependency-name: pytorch-lightning
  dependency-version: 2.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

demo-notebooks/guided-demos/notebook-ex-outputs/requirements.txt

@@ -1,4 +1,4 @@
-pytorch_lightning==2.4.0
+pytorch_lightning==2.6.0
 ray_lightning
 torchmetrics==1.8.2
 torchvision==0.20.1

demo-notebooks/guided-demos/preview_nbs/requirements.txt

@@ -1,4 +1,4 @@
-pytorch_lightning==2.4.0
+pytorch_lightning==2.6.0
 ray_lightning
 torchmetrics==1.8.2
 torchvision==0.20.1

demo-notebooks/guided-demos/requirements.txt

@@ -1,4 +1,4 @@
-pytorch_lightning==2.4.0
+pytorch_lightning==2.6.0
 ray_lightning
 torchmetrics==1.8.2
 torchvision==0.20.1