Bump serve-static and express in /examples/wasm/www #1062

Job	Run time
Build benchmarks	14s
Compute binary sizes	22s
Fuzz test (fill_first_fit)	2m 59s
Build documentation	16s
Fuzz test (fill_optimal_fit)	2m 59s
Minimum supported Rust version (no default features)	1m 59s
Ubuntu (stable, no default features)	21s
Fuzz test (fill_fast_path)	3m 5s
Minimum supported Rust version (all features)	2m 29s
Ubuntu (stable, all features)	40s
Fuzz test (wrap_first_fit)	3m 4s
Minimum supported Rust version (default features)	1m 59s
Build Wasm demo	23s
Ubuntu (stable, default features)	10s
Fuzz test (wrap_optimal_fit)	2m 58s
Ubuntu (nightly, no default features)	15s
Fuzz test (wrap_optimal_fit_usize)	3m 5s
Windows (stable, default features)	2m 15s
Ubuntu (nightly, all features)	27s
Fuzz test (wrap_fast_path)	3m 0s
Ubuntu (nightly, default features)	16s
Fuzz test (unfill)	3m 0s
Fuzz test (refill)	3m 10s
Deploy Wasm demo	0s
	39m 26s

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