Update actions/checkout action to v5

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	major	v4 -> v5

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Release Notes

actions/checkout (actions/checkout)

v5

Compare Source

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[radarhere]

Regarding the iOS simulator failure, this is also happening in main. I've found that GitHub Actions is also failing over at beeware/Python-Apple-support#313, so hopefully they will fix the problem.

[renovate]

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[radarhere]

#9161 has fixed the problem instead.