chore(deps): Group netlink dependabot updates (#3169)

This won't fix the issue in #2863 but will at least give Dependabot a
better chance at bumping them successfully.

.github/dependabot.yml

@@ -22,6 +22,10 @@ updates:
     schedule:
       interval: weekly
     groups:
+      netlink:
+        patterns:
+          - rtnetlink
+          - netlink-packet-*
       otel:
         patterns:
           - opentelemetry