Missing requirement for adafruit_hashlib

[FoamyGuy]

After a clean install with pip install adafruit-circuitpython-rsa when you attempt to import the module it raises an exception due to missing hashlib:

>>> import adafruit_rsa
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/timc/.local/lib/python3.10/site-packages/adafruit_rsa/__init__.py", line 19, in <module>
    from adafruit_rsa.pkcs1 import (
  File "/home/timc/.local/lib/python3.10/site-packages/adafruit_rsa/pkcs1.py", line 25, in <module>
    import adafruit_hashlib as hashlib
ModuleNotFoundError: No module named 'adafruit_hashlib'