Update to latest version of hiveplotlib

[pgleeson]

Errors were caused by hiveplotlib 0.26. See https://github.com/pgleeson/ConnectomeToolbox/actions/runs/18378247683

https://pypi.org/project/hiveplotlib/#history

Version of this is pinned in pgleeson@0967715, but code for hive plot generation could be updated to use the latest version:

https://github.com/pgleeson/ConnectomeToolbox/blob/0967715297fbe3f2bfdf7820fdb877a0d0064902/cect/ConnectomeDataset.py#L891