Update dependabot config

* Switch to weekly schedule for dependabot checks 
* Use a maximum of three open pull requests for version updates

Author: ocean90

.github/dependabot.yml

@@ -3,20 +3,16 @@ updates:
   - package-ecosystem: "composer"
     directory: "/"
     schedule:
-      interval: "daily"
-      time: "04:00"
+      interval: "weekly"
+      day: "tuesday"
+      time: "06:00"
       timezone: "Europe/Zurich"
-    open-pull-requests-limit: 10
-    reviewers:
-      - "ocean90"
-
+    open-pull-requests-limit: 3
   - package-ecosystem: "npm"
     directory: "/"
-    versioning-strategy: increase
     schedule:
-      interval: "daily"
-      time: "04:00"
+      interval: "weekly"
+      day: "tuesday"
+      time: "06:00"
       timezone: "Europe/Zurich"
-    open-pull-requests-limit: 10
-    reviewers:
-      - "ocean90"
+    open-pull-requests-limit: 3