New NeXus version

NeXus v2025.11 was just released: https://github.com/nexusformat/definitions/releases/tag/v2025.11

There may be useful changes for us. Even if ECDC don't use them yet, we can use them for outputs.

Notably, BIFROST wants to make use of the new `NXcomponent` base class and its `inputs` and `outputs` members to replace the numbering system in its files. So we should add support for that.