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

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	major	v5 -> v6

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Release Notes

actions/checkout (actions/checkout)

v6

Compare Source

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[dbasunag]

/lgtm

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Status of building tag latest: success.
Status of pushing tag latest to image registry: success.