Tell dependabot to cool it a bit

(changed the update interval for Gradle dependencies from weekly to monthly)

Author: jake-low

.github/dependabot.yml

@@ -5,4 +5,4 @@ updates:
   - package-ecosystem: "gradle" # See documentation for possible values
     directory: "/" # Location of package manifests
     schedule:
-      interval: "weekly"
+      interval: "monthly"