Relax jaxtyping version constraint in setup.py

[calbach]

gpytorch currently pins a single version of jaxtyping, which causes dependency issues when installing this package in combination with others: https://github.com/cornellius-gp/gpytorch/blob/c62c324aff0732ab0a1b6f37119e27f4612e33a7/setup.py#L42 . Please remove the restriction or relax this dependency if possible.

Note: A similar issue exists in the linear-operator package (v0.5.3 and later).

Thanks

[gpleiss]

@calbach we had issues with relaxing this dependency in LinearOperator and having the tests run appropriately. If you successfully relax this dependency in LinearOperator, I will happily merge a PR in both libraries!