Fix stale workflow authentication using GITHUB_TOKEN

[Copilot]

The stale issues workflow was failing with "Parameter token or opts.auth is required" because it referenced secrets.YARNBOT_TOKEN, which doesn't exist in this forked repository.

Changes

• Updated .github/workflows/stale-workflow.yml to use secrets.GITHUB_TOKEN instead of secrets.YARNBOT_TOKEN

The GITHUB_TOKEN is automatically provisioned by GitHub Actions and has sufficient permissions for issue management operations.

- uses: actions/stale@v6
  with:
-   repo-token: ${{secrets.YARNBOT_TOKEN}}
+   repo-token: ${{secrets.GITHUB_TOKEN}}

Original prompt

Reference: https://github.com/Sawsqr68/berry_s/actions/runs/20637761548/job/59265064554#step:2:1

Error: Error: Parameter token or opts.auth is required

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