Merge branch '47851-bump-cache-for-old-master-permission' into 'master'

Resolve "Reference to master still cached"

Closes #47851

See merge request gitlab-org/gitlab-ce!19827

app/helpers/projects_helper.rb

@@ -176,7 +176,7 @@ 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?