chore(dependabot): limit PRs to max 3

Author: char0n

.github/dependabot.yaml

@@ -7,7 +7,7 @@ updates:
     commit-message:
       prefix: "chore"
       include: "scope"
-    open-pull-requests-limit: 10
+    open-pull-requests-limit: 3
     ignore:
       # node-fetch must be synced manually
       - dependency-name: "node-fetch"