⬆️ upgrade actions/checkout action to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	major	v4 → v6

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Release Notes

actions/checkout (actions/checkout)

v6

Compare Source

v5

Compare Source

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Configuration

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Project	Deployment	Review	Updated (UTC)
onruntime-website	Ready	Preview, Comment	Jan 10, 2026 10:07pm

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