Dependabot config and cron update (#10)

Author: kattni

.github/dependabot.yml

@@ -1,17 +1,19 @@
 version: 2
+
+multi-ecosystem-groups:
+  dependencies:
+    schedule:
+      # Check for updates on the first Sunday of every month, 8PM UTC
+      interval: "cron"
+      cronjob: "0 20 * * sun#1"
+
 updates:
   - package-ecosystem: "github-actions"
     directory: "/"
-    schedule:
-      # Check for updates on Sunday, 8PM UTC
-      interval: "weekly"
-      day: "sunday"
-      time: "20:00"
+    patterns: ["*"]
+    multi-ecosystem-group: "dependencies"
 
   - package-ecosystem: "pip"
     directory: "/"
-    schedule:
-      # Check for updates on Sunday, 8PM UTC
-      interval: "weekly"
-      day: "sunday"
-      time: "20:00"
+    patterns: ["*"]
+    multi-ecosystem-group: "dependencies"