`std::mem::size_of` is not in the prelude of the MSRV #527

Job	Run time
build (stable, --features "")	1m 26s
build (stable, --all-features)	2m 4s
build_and_test_windows	4m 29s
clippy	47s
build_and_test_macos (macos-13)	2m 19s
build_and_test_macos (macos-latest)	48s
fmt	47s
build (stable, --no-default-features)	26s
minimal-versions	2m 27s
build (1.76, --features "")	47s
semver	1m 50s
test	2m 37s
build (1.76, --all-features)	1m 27s
codecov	4m 0s
build (1.76, --no-default-features)	29s
build (beta, --features "")	43s
build (beta, --all-features)	2m 0s
build (beta, --no-default-features)	35s
build (nightly, --features "")	1m 30s
build (nightly, --all-features)	1m 35s
build (nightly, --no-default-features)	48s
	33m 54s

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