Update dependabot.yml to create updates monthly

Author: arnested

.github/dependabot.yml

@@ -4,10 +4,10 @@ updates:
   - package-ecosystem: docker
     directory: "/"
     schedule:
-      interval: daily
+      interval: monthly
       timezone: Europe/Copenhagen
   - package-ecosystem: github-actions
     directory: "/"
     schedule:
-      interval: daily
+      interval: monthly
       timezone: Europe/Copenhagen