We previously switched the cryptography dependency to the development
branch to get reproducible builds using https://github.com/pyca/cryptography/pull/10627
This change has now been put into the 43.0.0 release so we switch to 43.0.1
This makes the AppImage build faster and more reliable (the `pip install` via github for this package often times-out)
This is a backport of electroncash#2902