Apply suggestion from @juergen-walter

Co-authored-by: Jürgen Walter <juergen.walter@sap.com>

Author: KarstenSchnitter

.github/dependabot.yml

@@ -5,6 +5,9 @@ updates:
     schedule:
       interval: "daily"
     target-branch: "main"
+    labels:
+      - "dependencies"
+      - "main-branch"
     open-pull-requests-limit: 10
   - package-ecosystem: "maven"
     directory: "/"