Defined python-cryptography as runtime dependency

Benjaminrequested to merge
asbachb/archinstall:bugfix/dep-python-cryptography into main

Without that dependency the archinstall binary fails:

$ archinstall
Traceback (most recent call last):
  File "/usr/bin/archinstall", line 5, in <module>
    from archinstall import run_as_a_module
  File "/usr/lib/python3.13/site-packages/archinstall/__init__.py", line 9, in <module>
    from archinstall.lib.args import arch_config_handler
  File "/usr/lib/python3.13/site-packages/archinstall/lib/args.py", line 15, in <module>
    from archinstall.lib.crypt import decrypt
  File "/usr/lib/python3.13/site-packages/archinstall/lib/crypt.py", line 6, in <module>
    from cryptography.fernet import Fernet, InvalidToken
ModuleNotFoundError: No module named 'cryptography'

This fixes #4 (closed)

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