Remove get_random_bytes from cryptography backend #381
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The RAND_bytes binding has been removed in cryptography 45.0. The
recommendation[1] is now to rely on
os.urandom, which is alreadyimplemented in the native backend.
The pycrpto implementation was removed earlier, so this removes the
leftover attempt to import it.
Closes: #380
[1] https://cryptography.io/en/latest/random-numbers/