Enable mypy for kombu/utils/encoding.py

Author: Harry-Lees

setup.cfg

@@ -52,6 +52,7 @@ ignore_missing_imports = True
 files =
     kombu/abstract.py,
     kombu/utils/debug.py,
+    kombu/utils/encoding.py,
     kombu/utils/time.py,
     kombu/utils/uuid.py,
     t/unit/utils/test_uuid.py,