Bump actions/upload-artifact from 3 to 4 #1091

Job	Run time
Build benchmarks	37s
Minimum supported Rust version (no default features)	14s
Ubuntu (stable, no default features)	11s
Windows (stable, default features)	46s
Ubuntu (stable, all features)	19s
Minimum supported Rust version (all features)	22s
Compute binary sizes	23s
Ubuntu (stable, default features)	15s
Build documentation	5s
Minimum supported Rust version (default features)	19s
Ubuntu (nightly, no default features)	15s
Ubuntu (nightly, all features)	29s
Fuzz test (fill_first_fit)	3m 0s
Build Wasm demo	17s
Ubuntu (nightly, default features)	16s
Fuzz test (fill_optimal_fit)	3m 1s
Fuzz test (fill_fast_path)	3m 1s
Fuzz test (wrap_first_fit)	2m 59s
Fuzz test (wrap_optimal_fit)	3m 8s
Fuzz test (wrap_optimal_fit_usize)	3m 5s
Fuzz test (wrap_fast_path)	3m 6s
Fuzz test (unfill)	2m 58s
Fuzz test (refill)	3m 5s
Deploy Wasm demo	0s
	32m 11s

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