remove dead assignment (#3247)

Author: pongad

utilities/bump_versions.py

@@ -96,7 +96,6 @@ def bump_versions(next_version_type, bump_type):
 
             (module, released_version_str, current_version_str) = version_line.split(':')
             released_version = Version(released_version_str)
-            current_version = Version(current_version_str)
 
             if next_version_type == 'next_release':
                 released_version.bump(bump_type)