chore: 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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[barmac]

fsevents is an optional dependency. There's no reason to have it installed on ubuntu, yet the npm ci complains on CI.

[renovate]

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You can manually request rebase by checking the rebase/retry box above.

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[nikku]

Odd, it works locally for me:

git checkout renovate/actions-checkout-6.x
npm ci

[nikku]

@barmac This seems to be an issue fixed with [email protected] and the packaged npm version. After the update to [email protected] I see fsevents being added to package-lock.json, cf. dc62288.