build(deps-dev): update actions/download|upload-artifact action to v4… #252

Job	Run time
Lint / Code	23s
Test / All tests	42s
Style / Format check	16s
Build / Build and prerender app	1m 21s
Performance / Lighthouse	3m 12s
Deploy to Cloudflare Pages (pro) / Deploy to Cloudflare Pages	30s
Deploy to GitHub Pages (latest) / Deploy to GitHub Pages	25s
	6m 49s

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