relax when the SIMD `copy_chunked_within` can be used #825

Job	Run time
Clippy	15s
Clippy (--no-default-features --features="c-allocator")	13s
QEMU build & test (stable, ubuntu-latest, s390x-unknown-linux-gnu, s390x-linux-gnu-gcc)	41s
Clippy (--no-default-features --features="rust-allocator")	16s
Build and test (stable, ubuntu-latest, x86_64-unknown-linux-gnu)	1m 15s
Smoke-test fuzzing targets	2m 1s
QEMU build & test (stable, ubuntu-latest, i686-unknown-linux-gnu, i686-linux-gnu-gcc)	33s
Build and test (msrv, ubuntu-latest, x86_64-unknown-linux-gnu)	57s
Smoke-test fuzzing targets (--no-default-features --features="c-allocator")	1m 7s
Build and test (beta, ubuntu-latest, x86_64-unknown-linux-gnu)	56s
dynamic library	16s
Smoke-test fuzzing targets (--no-default-features --features="rust-allocator")	49s
Build and test (stable, macos-latest, x86_64-apple-darwin)	1m 15s
Miri	2m 17s
Build and test (stable, macos-14, aarch64-apple-darwin)	55s
wasm32	39s
Build and test (stable-x86_64-gnu, windows-2022, x86_64-pc-windows-gnu)	1m 29s
Smoke-test fuzzing targets (stable, macos-14, aarch64-apple-darwin)	2m 24s
	18m 18s

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