Bump torch from 2.3.0 to 2.6.0 in /requirements/dev

Bumps [torch](https://github.com/pytorch/pytorch) from 2.3.0 to 2.6.0.
- [Release notes](https://github.com/pytorch/pytorch/releases)
- [Changelog](https://github.com/pytorch/pytorch/blob/main/RELEASE.md)
- [Commits](pytorch/pytorch@v2.3.0...v2.6.0)

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

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

Author: dependabot[bot]

requirements/dev/notebook-ci.txt

@@ -3,7 +3,7 @@ nbformat==5.10.4
 nbclient==0.10.2
 ipykernel==6.26.0
 scipy == 1.14.0
-torch==2.3.0
+torch==2.6.0
 torch-scatter==2.1.1
 torch-sparse==0.6.17
 torch-geometric>=2.5.0