Update EXtra-geom to 1.6
Description
Prevents incompatible cfelpyutils 2.0 being installed until we're ready for it. Also makes improvements in EXtra-geom available for calibration notebooks.
How Has This Been Tested?
EXtra-geom has CI, and we haven't deliberately broken any APIs since 1.1.1.
Relevant Documents (optional)
https://extra-geom.readthedocs.io/en/latest/changelog.html
Types of changes
- Bug fix (non-breaking change which fixes an issue)