chore: Update dependabot config

Author: CHR-onicles

.github/dependabot.yml

@@ -8,5 +8,5 @@ updates:
   - package-ecosystem: "npm" # See documentation for possible values
     directory: "/" # Location of package manifests
     schedule:
-      interval: "daily"
+      interval: "monthly"
     open-pull-requests-limit: 15