Copy Depedabot config directly from example repo (#254)

https://github.com/SentryMan/avaje-javalin-api-example/blob/master/.github/dependabot.yml

Author: SentryMan

.github/dependabot.yml

@@ -1,26 +1,26 @@
 version: 2
 updates:
-- package-ecosystem: maven
-  directory: "/"
-  schedule:
-    interval: "weekly"
-  open-pull-requests-limit: 10
-  groups:
-    dependencies:
-      patterns:
+  - package-ecosystem: "maven"
+    directory: "/"
+    schedule:
+      interval: weekly
+    open-pull-requests-limit: 10
+    groups:
+      dependencies:
+        patterns:
         - "*"
+    labels:
+      - "dependencies"
+    target-branch: "master"
+
 
-- package-ecosystem: "github-actions"
+  - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
-      interval: "weekly"
+      interval: weekly
     open-pull-requests-limit: 5
     commit-message:
       prefix: "[workflow]"
     labels:
       - "dependencies"
-    target-branch: "master"  
-    groups:
-      dependencies:
-        patterns:
-        - "*"
+    target-branch: "master"