chore: Update dependabot config to consider custom setup action (#386)

These custom setup action still uses setup-java v4.7.1 and cache v4.2.4
...

Author: adangel

.github/dependabot.yml

@@ -13,7 +13,9 @@ updates:
     # Allow up to 10 open pull requests for maven dependencies
     open-pull-requests-limit: 10
   - package-ecosystem: "github-actions"
-    directory: "/"
+    directories:
+      - /
+      - /.github/actions/setup
     schedule:
       interval: "weekly"
       day: "wednesday"