Update actions/checkout action to v6 - autoclosed

[elastic-renovate-prod]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	major	v2 -> v6

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Release Notes

actions/checkout (actions/checkout)

v6

Compare Source

• Fix checkout init for SHA-256 repositories by @​yaananth in https://github.com/actions/checkout/pull/2439
• fix: expand merge commit SHA regex and add SHA-256 test cases by @​yaananth in https://github.com/actions/checkout/pull/2414

v5

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

v4

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• Port v6 cleanup to v4 by @​ericsciple in https://github.com/actions/checkout/pull/2305

v3

Compare Source

• Fix: Mark test scripts with Bash'isms to be run via Bash
• Add option to fetch tags even if fetch-depth > 0

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Configuration

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This PR has been generated by Renovate Bot.