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

[isn-renovate]

This PR contains the following updates:

Package	Type	Update	Change	OpenSSF
actions/checkout	action	major	v4.3.1 -> v6.0.2

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Release Notes

actions/checkout (actions/checkout)

v6.0.2

Compare Source

• Fix tag handling: preserve annotations and explicit fetch-tags by @​ericsciple in https://github.com/actions/checkout/pull/2356

v6.0.1

Compare Source

• Add worktree support for persist-credentials includeIf by @​ericsciple in https://github.com/actions/checkout/pull/2327

v6.0.0

Compare Source

• 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

v5.0.1

Compare Source

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

v5.0.0

Compare Source

• Update actions checkout to use node 24 by @​salmanmkc in https://github.com/actions/checkout/pull/2226

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