bump version for PyTorch 2.6

[ad8e]

Same as #159

Solution is to install megablocks without causing a torch reinstall. (In particular, changing to torch>=2.0.0 doesn't work, but torch>=2.6.0 works.)

Or actually not, that also failed.

[rank0]:   File "/mnt/clusterstorage/workspace/kevin/megablocks/megablocks/ops/cumsum.py", line 13, in <module>
[rank0]:     import megablocks_ops as ops  # type: ignore
[rank0]: ImportError: /mnt/clusterstorage/workspace/kevin/megablocks/megablocks_ops.cpython-310-x86_64-linux-gnu.so: undefined symbol: _ZN3c106detail23torchInternalAssertFailEPKcS2_jS2_RKSs