community/ceph18: mgr modules fail to load due to new py3-cryptography

A recent version of py3-cryptography started using rust code which now causes the ceph mgr daemon modules not to load.

This was worked-around upstream by just removing the py3-jwt dependency. I think we should probably apply the upstream patch and drop the py3-jwt dependency (which should in turn drop the py3-cryptography dep).

https://github.com/ceph/ceph/pull/54710/files

cc: @a16bitsysop