build(gh): reduce the frequency of dependabot PR submissions

Author: cotes2020

.github/dependabot.yml

@@ -7,20 +7,20 @@ updates:
       bundler:
         dependency-type: "production"
     schedule:
-      interval: "weekly"
+      interval: "monthly"
   - package-ecosystem: "npm"
     directory: "/"
     versioning-strategy: increase
     groups:
       npm:
         dependency-type: "development"
     schedule:
-      interval: "weekly"
+      interval: "monthly"
   - package-ecosystem: "github-actions"
     directory: "/"
     groups:
       gh-actions:
         update-types:
           - "major"
     schedule:
-      interval: "weekly"
+      interval: "monthly"