Update torchmetrics requirement from <0.11.0 to <0.12.0 in /requirements

Updates the requirements on [torchmetrics](https://github.com/Lightning-AI/metrics) to permit the latest version.
- [Release notes](https://github.com/Lightning-AI/metrics/releases)
- [Changelog](https://github.com/Lightning-AI/torchmetrics/blob/master/CHANGELOG.md)
- [Commits](Lightning-AI/torchmetrics@v0.1.0...v0.11.4)

---
updated-dependencies:
- dependency-name: torchmetrics
  dependency-type: direct:production
...

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

requirements.txt

@@ -1,5 +1,5 @@
 numpy <1.25.0
 pytorch-lightning >1.7.0, <1.9.0  # strict
-torchmetrics <0.11.0  # strict
+torchmetrics <0.12.0  # strict
 lightning-utilities >0.3.1  # this is needed for PL 1.7
 torchvision >=0.10.0  # todo: move to topic related extras