feat: Add Dependabot config [sc-116626] (#35425)

Author: sunitha1814

.github/dependabot.yml

@@ -5,12 +5,25 @@
 
 version: 2
 updates:
-  - package-ecosystem: "github-actions"
+  # Go module dependencies
+  - package-ecosystem: "gomod"
     directory: "/"
     schedule:
       interval: "weekly"
+      day: "wednesday"
+    open-pull-requests-limit: 3
+    labels:
+      - "dependencies"
+    groups:
+      go-dependencies:
+        patterns:
+          - "*"
 
-  - package-ecosystem: "gomod"
+  # GitHub Actions
+  - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
-      interval: "weekly"
+      interval: "monthly"
+    open-pull-requests-limit: 3
+    labels:
+      - "github-actions"