Update torch requirement from <2.3,>=1.13 to >=1.13,<2.7 in /tests

Updates the requirements on [torch](https://github.com/pytorch/pytorch) to permit the latest version.
- [Release notes](https://github.com/pytorch/pytorch/releases)
- [Changelog](https://github.com/pytorch/pytorch/blob/main/RELEASE.md)
- [Commits](pytorch/pytorch@v1.13.0...v2.6.0)

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

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

Author: dependabot[bot]

tests/constraints.txt

@@ -29,4 +29,4 @@ networkx<=3.3
 keras>=2.0.0,<3.0.0
 
 --extra-index-url https://download.pytorch.org/whl/cpu
-torch>=1.13,<2.3
+torch>=1.13,<2.7