Change dependabot interval to monthly + group production deps too. (#438)

Too much maintnence burden to review weekly... and we may aswell
just review all the production deps at the same time so we can
checkout the branch and just fix things that are broken.

.github/dependabot.yml

@@ -3,15 +3,17 @@ updates:
   - package-ecosystem: "npm"
     directory: "/"
     schedule:
-      interval: "weekly"
+      interval: "monthly"
     groups:
       development-dependencies:
         dependency-type: "development"
+      production-dependencies:
+        dependency-type: "production"
 
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
-      interval: "weekly"
+      interval: "monthly"
     groups:
       github-actions:
         patterns: