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

Bumps [torchmetrics](https://github.com/Lightning-AI/torchmetrics) from 1.5.1 to 1.6.0.
- [Release notes](https://github.com/Lightning-AI/torchmetrics/releases)
- [Changelog](https://github.com/Lightning-AI/torchmetrics/blob/master/CHANGELOG.md)
- [Commits](Lightning-AI/torchmetrics@v1.5.1...v1.6.0)

---
updated-dependencies:
- dependency-name: torchmetrics
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

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

@@ -1,4 +1,4 @@
 pytorch_lightning==2.4.0
 ray_lightning
-torchmetrics==1.5.1
+torchmetrics==1.6.0
 torchvision==0.20.1

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

@@ -1,4 +1,4 @@
 pytorch_lightning==2.4.0
 ray_lightning
-torchmetrics==1.5.1
+torchmetrics==1.6.0
 torchvision==0.20.1

demo-notebooks/guided-demos/requirements.txt

@@ -1,4 +1,4 @@
 pytorch_lightning==2.4.0
 ray_lightning
-torchmetrics==1.5.1
+torchmetrics==1.6.0
 torchvision==0.20.1