fix: update find-exercise workflow to also work on closed issues #71
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This could be useful in some occasions, one that I've run into is people completing the Getting Started with Copilot exercise and only after finishing they notice the bonus step.
The bonus step workflow was still enabled, but it would fail because the
find-exerciseworkflow was only looking for open issues.https://docs.github.com/en/rest/issues/issues?apiVersion=2022-11-28#list-repository-issues

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