change dependabot interval

Author: uiolee

.github/dependabot.yml

@@ -8,7 +8,7 @@ updates:
   - package-ecosystem: "npm"
     directory: "/"
     schedule:
-      interval: "weekly"
+      interval: "monthly"
     labels:
       - "dependencies"
       - "npm"
@@ -28,7 +28,7 @@ updates:
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
-      interval: "weekly"
+      interval: "monthly"
     labels:
       - "dependencies"
       - "github_actions"