Update actions/checkout action to v6.1.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	minor	v6.0.2 → v6.1.0

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Release Notes

actions/checkout (actions/checkout)

v6.1.0

Compare Source

v6.0.3

Compare Source

• 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

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Pull request overview

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Updates the documentation workflow to use a newer pinned revision of actions/checkout for the “Test deployment” jobs.

Changes:

• Bump actions/checkout pinned commit in two jobs within .github/workflows/documentation.yml.

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