build

Update MSRV to 1.66 because of `unicode-width` dep #1074

Job	Run time
Build benchmarks	40s
Compute binary sizes	24s
Build documentation	29s
Fuzz test (fill_first_fit)	3m 40s
Minimum supported Rust version (no default features)	52s
Fuzz test (fill_optimal_fit)	3m 38s
Ubuntu (stable, no default features)	40s
Minimum supported Rust version (all features)	1m 1s
Fuzz test (fill_fast_path)	3m 32s
Ubuntu (stable, all features)	41s
Fuzz test (wrap_first_fit)	3m 30s
Minimum supported Rust version (default features)	55s
Ubuntu (stable, default features)	28s
Fuzz test (wrap_optimal_fit)	3m 35s
Ubuntu (nightly, no default features)	28s
Fuzz test (wrap_optimal_fit_usize)	3m 32s
Build Wasm demo	24s
Ubuntu (nightly, all features)	31s
Fuzz test (wrap_fast_path)	3m 40s
Ubuntu (nightly, default features)	26s
Fuzz test (unfill)	3m 29s
Windows (stable, default features)	1m 49s
Fuzz test (refill)	3m 31s
Deploy Wasm demo	0s
	41m 55s

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