Update Renovatebot GHA Updates to v6

[protocols-renovate]

This PR contains the following updates:

Package	Type	Update	Change	Pending
actions/checkout	action	major	v4 → v6	v6.0.3

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Warning

Some dependencies could not be looked up. Check the warning logs for more information.

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Release Notes

actions/checkout (actions/checkout)

v6.0.2

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• Fix tag handling: preserve annotations and explicit fetch-tags by @​ericsciple in #​2356

v6.0.1

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• Add worktree support for persist-credentials includeIf by @​ericsciple in #​2327

v6.0.0

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• Persist creds to a separate file by @​ericsciple in #​2286
• Update README to include Node.js 24 support details and requirements by @​salmanmkc in #​2248

v6

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• Fix checkout init for SHA-256 repositories by @​yaananth in #​2439
• fix: expand merge commit SHA regex and add SHA-256 test cases by @​yaananth in #​2414

v5.0.1

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• Port v6 cleanup to v5 by @​ericsciple in #​2301

v5.0.0

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• Update actions checkout to use node 24 by @​salmanmkc in #​2226

v5

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• Port v6 cleanup to v5 by @​ericsciple in #​2301

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Note

Low Risk
Workflow-only dependency bump with pinned SHA; no application or security-validation logic changes.

Overview
Bumps actions/checkout from v4 to v6 in the Test Sanitize Docker Action workflow, in both matrix jobs (valid and invalid input cases).

Each Checkout Code step now uses a full commit SHA (de0fac2e…) with a # v6 comment instead of the floating @v4 tag, matching the repo’s Renovate pattern for supply-chain pinning.

^{Reviewed by Cursor Bugbot for commit 3391cd6. Bugbot is set up for automated code reviews on this repo. Configure here.}