Bump braces from 3.0.2 to 3.0.3 in /examples/wasm/www #1039

Job	Run time
Compute binary sizes	32s
Build benchmarks	30s
Build documentation	8s
Fuzz test (fill_first_fit)	48s
Fuzz test (fill_optimal_fit)	55s
Minimum supported Rust version (no default features)	16s
Fuzz test (fill_fast_path)	48s
Minimum supported Rust version (all features)	30s
Fuzz test (wrap_first_fit)	54s
Minimum supported Rust version (default features)	25s
Fuzz test (wrap_optimal_fit)	50s
Fuzz test (wrap_optimal_fit_usize)	51s
Ubuntu (stable, no default features)	25s
Fuzz test (wrap_fast_path)	53s
Build Wasm demo	17s
Ubuntu (stable, all features)	26s
Fuzz test (unfill)	47s
Ubuntu (stable, default features)	21s
Fuzz test (refill)	48s
Ubuntu (nightly, no default features)	14s
Windows (stable, default features)	1m 36s
Ubuntu (nightly, all features)	29s
Ubuntu (nightly, default features)	26s
Deploy Wasm demo	0s
	14m 9s

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