security/py-yubikey-manager: Fix dependencies, undeprecate

Upstream stopped using py-pycrypto in 2016. It uses py-cryptography,
which is pulled in indirectly through the dependency on py-fido2.

Therefore:

• Remove dependency on py-pycrypto
• Add dependency on py-cryptography (same version range as py-fido2)
• Undeprecate