There's a closed pull request on the void-packages repository

.github/workflows: disable scheduled cron jobs on forks
https://github.com/void-linux/void-packages/pull/37339

Description:
#### Testing the changes
- I tested the changes in this PR: **briefly**

Donot runs the cron-jobs of `stale.yml` and `cycles.yml` outside the `void-linux` repository-owner.