Merge branch 'sidebar-mono-font' into 'master'

Update sidebar branch font

See merge request gitlab-org/gitlab!42096

app/views/shared/issuable/_sidebar.html.haml

@@ -170,7 +170,7 @@
                 = clipboard_button(text: source_branch, title: _('Copy branch name'), placement: "left", boundary: 'viewport')
               .sidebar-mr-source-branch.hide-collapsed
                 %span
-                  = _('Source branch: %{source_branch_open}%{source_branch}%{source_branch_close}').html_safe % { source_branch_open: "<cite title='#{source_branch}'>".html_safe, source_branch_close: "</cite>".html_safe, source_branch: source_branch }
+                  = _('Source branch: %{source_branch_open}%{source_branch}%{source_branch_close}').html_safe % { source_branch_open: "<cite class='ref-name' title='#{source_branch}'>".html_safe, source_branch_close: "</cite>".html_safe, source_branch: source_branch }
                 = clipboard_button(text: source_branch, title: _('Copy branch name'), placement: "left", boundary: 'viewport')
 
         - if issuable_sidebar.dig(:current_user, :can_move)