chore(deps): update github actions to v6 (major)

[ggrossetie]

This PR contains the following updates:

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

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Release Notes

actions/checkout (actions/checkout)

v6

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• Persist creds to a separate file by @​ericsciple in https://github.com/actions/checkout/pull/2286
• Update README to include Node.js 24 support details and requirements by @​salmanmkc in https://github.com/actions/checkout/pull/2248

v5

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• Port v6 cleanup to v5 by @​ericsciple in https://github.com/actions/checkout/pull/2301

actions/setup-node (actions/setup-node)

v6

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v5

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