Flush cache for project list

For master->maintainer permission rename

app/helpers/projects_helper.rb

@@ -175,7 +175,7 @@ module ProjectsHelper
       controller.action_name,
       Gitlab::CurrentSettings.cache_key,
       "cross-project:#{can?(current_user, :read_cross_project)}",
-      'v2.5'
+      'v2.6'
     ]
     key << pipeline_status_cache_key(project.pipeline_status) if project.pipeline_status.has_status?