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

[thomhurst]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	major	v4 -> v6

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Release Notes

actions/checkout (actions/checkout)

v6

Compare Source

• 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

v5

Compare Source

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

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Configuration

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This PR has been generated by Renovate Bot.

[Copilot]

Pull request overview

This PR updates the actions/checkout GitHub Action from v4 to v6 in two workflow files, completing the repository-wide upgrade to the latest major version. The v6 release includes credential persistence improvements and Node.js 24 support.

Key Changes:

• Updated actions/checkout from v4 to v6 in Claude-related workflows
• No configuration changes required; this is a drop-in version update

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
.github/workflows/claude.yml	Updated checkout action to v6 for the Claude Code workflow
.github/workflows/claude-code-review.yml	Updated checkout action to v6 for the Claude Code Review workflow