Update python-gnupg from 0.4.5 to 0.4.6

requirements.txt

@@ -2,7 +2,7 @@
 # should be kept in sync. The list in setup.py is shorter, as it only
 # includes packages needed for deployment.
 
-python-gnupg==0.4.5    # Integration with gpg for key-cert objects
+python-gnupg==0.4.6    # Integration with gpg for key-cert objects
 passlib==1.7.2         # Password hashing for CRYPT-PW and MD5-PW
 IPy==1.00              # IP address parsing
 dataclasses==0.7; python_version < '3.7'       # PEP 557 dataclasses for python<3.7