update to pycryptodome > 3.19.0

[PascalinDe]

currently updating to pycryptodome > 3.19.0 breaks updating the cache:

Legrandin/pycryptodome@519e7ae - the return type changed from pycryptodome's own Integer type to Python's int type - both implement to_bytes, but in Python 3.9 it does not have a default argument for byteorder (unlike Integer)

Traceback (most recent call last):
  File "/home/runner/work/lightarti-directory/lightarti-directory/tools/./gen_fresh_dirinfo.py", line 1308, in <module>
    main(sys.argv[0], sys.argv[1:])
  File "/home/runner/work/lightarti-directory/lightarti-directory/tools/./gen_fresh_dirinfo.py", line 1301, in main
    namespace.callback(namespace)
  File "/home/runner/work/lightarti-directory/lightarti-directory/tools/./gen_fresh_dirinfo.py", line 1100, in generate_customized_consensus_cb
    generate_customized_consensus(
  File "/home/runner/work/lightarti-directory/lightarti-directory/tools/./gen_fresh_dirinfo.py", line 1026, in generate_customized_consensus
    consensus = generate_signed_consensus(
  File "/home/runner/work/lightarti-directory/lightarti-directory/tools/./gen_fresh_dirinfo.py", line 813, in generate_signed_consensus
    consensus_signed = sign_consensus(
  File "/home/runner/work/lightarti-directory/lightarti-directory/tools/./gen_fresh_dirinfo.py", line 717, in sign_consensus
    signature_b = authority_signing_key._decrypt(consensus_digest_i).to_bytes(
TypeError: to_bytes() missing required argument 'byteorder' (pos 2)