Allow more open pull requests

Sometimes, we don't straight away fix a broken build of a dependency.
This can prevent other dependencies from being updated.

.github/dependabot.yml

@@ -9,13 +9,16 @@ updates:
     directory: "/"
     schedule:
       interval: "daily"
+    open-pull-requests-limit: 10
 
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
       interval: "daily"
+    open-pull-requests-limit: 10
 
   - package-ecosystem: "npm"
     directory: "/taker-frontend"
     schedule:
       interval: "daily"
+    open-pull-requests-limit: 10