[BUG] tslearn version 0.6 introduces torch dependency

[TonyBagnall]

Describe the feature or idea you want to propose

tslearn (used in clustering) introduced new dependencies in version 0.6, including torch, which we are not ready to include as yet. We have pinned it at <0.6,

https://pypi.org/project/tslearn/

Describe your proposed solution

this issue is here to just remind us of this, and to explore removing the bound when we include torch as a softdep.

Describe alternatives you've considered, if relevant

No response

Additional context

No response

[MatthewMiddlehurst]

torch is now a regular soft dependency I believe with the addition of Hydra and Quant.