ci: add missing @ in actions/checkout SHA pins

[KooshaPari]

User description

6 workflows referenced \�ctions/checkout\ without the @\ separator, making the action reference invalid (job setup fails). Added the missing @\ across all affected workflows. Mechanical 1-char fix per ref; no logic change.

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CodeAnt-AI Description

Fix invalid checkout references in GitHub workflows

What Changed

• Corrected the checkout action reference in 6 workflows so they can start successfully again
• Prevents workflow setup from failing before checks run, including doc links, cargo checks, quality gate, FR coverage, and scorecard

Impact

✅ Fewer CI setup failures
✅ Reliable workflow runs
✅ Restored automated checks

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: c78597a4-7014-4f82-9595-91edfe652796

📥 Commits

Reviewing files that changed from the base of the PR and between e12339a and 9b3bb57.

📒 Files selected for processing (6)

• .github/workflows/cargo-machete.yml
• .github/workflows/cargo-semver-checks.yml
• .github/workflows/doc-links.yml
• .github/workflows/fr-coverage.yml
• .github/workflows/quality-gate.yml
• .github/workflows/scorecard.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/checkout-missing-at

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch fix/checkout-missing-at

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