Update actions/checkout action to v7

[renovate-runner]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	major	v4 -> v7

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Release Notes

actions/checkout (actions/checkout)

v7

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• Skip running unsafe pr check if input is default by @​aiqiaoy in #​2518
• Trim only ascii whitespace for branch by @​aiqiaoy in #​2521
• Escape values passed to --unset by @​aiqiaoy in #​2530
• Various dependency updates

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

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

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