dependabot on v2 branch (#1548)

Author: jeromevdl

.github/dependabot.yml

@@ -11,3 +11,12 @@ updates:
       # Ignore Mockito 5.X.X as it does not support Java 8
       - dependency-name: "org.mockito:mockito-*"
         update-types: ["version-update:semver-major"]
+
+  - package-ecosystem: "maven"
+    directory: "/"
+    target-branch: "v2"
+    schedule:
+      interval: "weekly"
+    labels:
+      - "maven"
+      - "dependencies"