Fix dependabot YAML error

Fix the error: The property '#/updates/0/schedule' contains additional properties ["open-pull-requests-limit"] outside of the schema when none are allowed

Author: protik09

.github/dependabot.yml

@@ -14,7 +14,6 @@ updates:
     directory: "/"
     schedule:
       interval: "daily"
-    open-pull-requests-limit: 10
     commit-message:
       prefix: "chore"
       include: "scope"