CI: Increase pull requests limit to 20 in dependabot (was 5)

Author: MekDrop

.github/dependabot.yml

@@ -4,15 +4,15 @@ updates:
     directory: "/"
     schedule:
       interval: monthly
-    open-pull-requests-limit: 10
+    open-pull-requests-limit: 20
     labels:
       - "dependencies"
       - "composer"
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
-      interval: "weekly"
-      time: "11:00"
+      interval: monthly
+    open-pull-requests-limit: 20
     labels:
       - "dependencies"
-      - "infrastructure"
+      - "infrastructure"