chore(deps): update actions/checkout action to v6 (spectrum-two)

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	major	v5 -> v6

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Release Notes

actions/checkout (actions/checkout)

v6

Compare Source

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Configuration

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[changeset-bot]

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Latest commit: 17fe6b1

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[github-actions]

📚 Branch preview

PR #4319 has been deployed to Azure Blob Storage: https://spectrumcss.z13.web.core.windows.net/pr-4319/index.html.

[github-actions]

File metrics

Summary

Total size: 1.41 MB^*

🎉 No changes detected in any packages

* Size is the sum of all main files for packages in the library.
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[renovate]

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Because you closed this PR without merging, Renovate will ignore this update. You will not get PRs for any future 6.x releases. But if you manually upgrade to 6.x then Renovate will re-enable minor and patch updates automatically.

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