Change the interval for dependabot updates to monthly (#213)

Author: ErikSchierboom

.github/dependabot.yml

@@ -4,20 +4,20 @@ updates:
   - package-ecosystem: github-actions
     directory: "/"
     schedule:
-      interval: daily
+      interval: 'monthly'
     labels:
       - "x:size/tiny"
 
   - package-ecosystem: gradle
     directory: "/"
     schedule:
-      interval: weekly
+      interval: 'monthly'
     labels:
       - "x:size/small"
 
   - package-ecosystem: docker
     directory: "/"
     schedule:
-      interval: weekly
+      interval: 'monthly'
     labels:
       - "x:size/small"