_get_most_recent_version should not return the version number any more: if the lock was not acquired, this would hit an error

Author: mattsb42-aws

src/dynamodb_encryption_sdk/material_providers/most_recent.py

@@ -247,7 +247,7 @@ def _get_most_recent_version(self, allow_local):
             # If blocking, we will never reach this point.
             # If not blocking, we want whatever the latest local version is.
             version = self._version
-            return version, self._cache.get(version)
+            return self._cache.get(version)
 
         try:
             max_version = self._get_max_version()