Fix: Star collection script breaks because debuglibrary moved to imbus

[Noordsestern]

The star collection script fails, because debuglibrary has been moved:

Error: Error: 301 on https://api.github.com/repos/xyb/robotframework-debuglibrary
    at getStars (file:///home/runner/work/robotframework.github.com/robotframework.github.com/src/js/scheduled.mjs:90:11)
    at processTicksAndRejections (internal/process/task_queues.js:95:5)

[github-actions]

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