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CI: Migrate to `{upload, download}-artifact@v4` #1511

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Run time

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Job	Run time
Test on ubuntu-latest	2m 48s
Test on windows-latest	3m 58s
Bitrot	2m 43s
Build target wasm32-wasi	1m 49s
Test on macOS-latest	4m 6s
Clippy (MSRV)	2m 30s
Code coverage	3m 31s
Intra-doc links	2m 25s
Rustfmt	10s
	24m 0s