ci(dependabot): run monthly

.github/dependabot.yml

@@ -1,13 +1,13 @@
 # Please see the documentation for all configuration options:
-# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+# https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
 
 version: 2
 updates:
   - package-ecosystem: "npm"
     directory: "/"
     open-pull-requests-limit: 30
     schedule:
-      interval: "weekly"
+      interval: "monthly"
     commit-message:
       prefix: "build(npm):"
     ignore:
@@ -17,6 +17,6 @@ updates:
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
-      interval: "weekly"
+      interval: "monthly"
     commit-message:
       prefix: "ci(actions):"