Remove cryptography warning workaround

This reverts "Suppress warning from cryptography about deprecated Python
3.8 support" (8987cfd) since 3.8 is no longer supported.

Author: victorlin

nextstrain/cli/authn/session.py

@@ -2,18 +2,8 @@
 Authentication sessions.
 """
 import boto3
-import warnings
-
-# Ignore noisy warning from cryptography 47.0.0 about deprecated support for Python 3.8
-with warnings.catch_warnings():
-    warnings.filterwarnings(
-        "ignore",
-        message = "Python 3\\.8 is no longer supported by the Python core team and support for it is deprecated",
-        category = UserWarning
-    )
-    import jwt
-    import jwt.exceptions
-
+import jwt
+import jwt.exceptions
 import secrets
 
 from base64 import b64encode