lint fix

Author: Colin

src/timeline/timeline-item.scss

@@ -31,6 +31,7 @@
   height: $spacer-5;
   margin-right: $spacer-2;
   margin-left: -$spacer-3 + 1;
+  // stylelint-disable-next-line primer/colors
   color: var(--color-icon-secondary);
   align-items: center;
   background-color: var(--color-timeline-badge-bg);