chore: add configuration for Dependabot to search for dependency update in the final branch

Author: Piotr Kubicki

.github/dependabot.yml

@@ -9,4 +9,10 @@ updates:
     directory: "/"  # Root directory where pom.xml is located
     schedule:
       interval: "weekly"  # Dependabot will check for updates every week
-    open-pull-requests-limit: 5  # Optional: Limit the number of open PRs from Dependabot
+    target-branch: "main"
+
+  - package-ecosystem: "maven"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    target-branch: "feature/5-security"   # 👈 second branch config