Bump webpack-dev-middleware from 5.3.3 to 5.3.4 in /examples/wasm/www #1079

Job	Run time
Build documentation	6s
Build benchmarks	40s
Compute binary sizes	41s
Fuzz test (fill_first_fit)	3m 10s
Minimum supported Rust version (no default features)	26s
Fuzz test (fill_optimal_fit)	3m 0s
Ubuntu (stable, no default features)	20s
Build Wasm demo	32s
Fuzz test (fill_fast_path)	3m 10s
Minimum supported Rust version (all features)	22s
Ubuntu (stable, all features)	33s
Ubuntu (stable, default features)	21s
Minimum supported Rust version (default features)	13s
Windows (stable, default features)	40s
Ubuntu (nightly, no default features)	15s
Fuzz test (wrap_first_fit)	2m 59s
Ubuntu (nightly, all features)	23s
Fuzz test (wrap_optimal_fit)	3m 0s
Ubuntu (nightly, default features)	20s
Fuzz test (wrap_optimal_fit_usize)	3m 9s
Fuzz test (wrap_fast_path)	3m 5s
Fuzz test (unfill)	2m 59s
Fuzz test (refill)	3m 5s
Deploy Wasm demo	0s
	33m 29s

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