fix: add missing github-actions grouping to dependabot.yml

Co-authored-by: Malcolmnixon <1863707+Malcolmnixon@users.noreply.github.com>

Author: Copilot

.github/dependabot.yml

@@ -20,3 +20,7 @@ updates:
       interval: "weekly"
       day: "monday"
     open-pull-requests-limit: 10
+    groups:
+      github-actions-dependencies:
+        patterns:
+          - "*"