Update umbrelladocs/action-linkspector digest to 568ec8d

[ci-protocols-renovate]

This PR contains the following updates:

Package	Type	Update	Change
umbrelladocs/action-linkspector (changelog)	action	digest	036f295 → 568ec8d

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This PR has been generated by Mend Renovate.

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Note

Low Risk
Routine CI action digest bump with no application or security-sensitive logic changes.

Overview
Pins the nightly link-check GitHub Action to a newer umbrelladocs/action-linkspector commit (036f295 → 568ec8d) while keeping the # v1 tag comment unchanged.

Only .github/workflows/nightly.yml is touched; checkout, reporter settings, and Slack failure notification are unchanged.

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1 out of 2 committers have signed the CLA.
✅ (alexandratran)[https://github.com/alexandratran]
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