Update `std::math::u64` according to the new u32 refactoring #4194

Job	Run time
rustfmt	12s
Check Rust stable on ubuntu with --all-targets --no-default-features	1m 1s
no-std (stable, wasm32-unknown-unknown)	51s
Clippy	36s
Check Rust stable on ubuntu with --all-targets	1m 10s
no-std (nightly, wasm32-unknown-unknown)	1m 10s
Test Rust stable on ubuntu with --profile test-release	10m 28s
Check Rust stable on ubuntu with --all-targets --all-features	1m 26s
Check Rust nightly on ubuntu with --all-targets --no-default-features	1m 23s
Test Rust stable on ubuntu with --profile test-release --doc	5m 51s
Test Rust nightly on windows-2022	0s
Check Rust nightly on ubuntu with --all-targets	1m 3s
Test Rust nightly on ubuntu with --profile test-release	10m 28s
Check Rust nightly on ubuntu with --all-targets --all-features	1m 16s
Test Rust nightly on ubuntu with --profile test-release --doc	2m 56s
	39m 51s

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