ci: update dependabot

.github/dependabot.yml

@@ -1,6 +1,15 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://help.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
 version: 2
 updates:
   - package-ecosystem: "gomod"
     directory: "/"
+    labels:
+      - "go"
+      - "dependencies"
     schedule:
-      interval: "monthly"
+      interval: "weekly"
+    target-branch: master