For Python 3.13 source cffi and freezegun from github

Author: notatallshaw

tests/requirements.txt

@@ -1,5 +1,7 @@
+cffi @ https://github.com/python-cffi/cffi/archive/refs/heads/main.zip; python_version > "3.12" # Temporary workaround for Python 3.13 until next CFFI release
 cryptography
-freezegun
+freezegun; python_version <= "3.12"
+freezegun @ https://github.com/spulec/freezegun/archive/refs/heads/master.zip; python_version > "3.12" # Temporary workaround for Python 3.13 until next frezegun release
 installer
 pytest
 pytest-cov