Pyemir

What's Changed
* Using sep-pjw (fixes 150)
* Supporting numpy 2.x
* Added extension ICHANNEL containing the reprojected layout of the channels
* Provide ad hoc sky correction for the H2RG detector

Add support of new EMIR detector


**Full Changelog**: https://github.com/guaix-ucm/pyemir/compare/v0.20...v0.21

Maintenance update:
* Works with python 3.12
* Fixes for ReadTheDocs
* Correcting several deprecations in scipy and photutils

**Full Changelog**: https://github.com/guaix-ucm/pyemir/compare/v0.19...v0.20

Improvements:
* Fix problems in imaging mode when combining crowded fields