chore: swap blockenv values instead of cloning #43

Job	Run time
check no_std	14s
docs	30s
clippy	29s
doctest	37s
feature-checks	23s
feature-propagation	51s
fmt	12s
test ubuntu-latest stable --no-default-features	30s
wasm-unknown	26s
wasm-wasi	34s
test ubuntu-latest stable	29s
test ubuntu-latest stable --all-features	26s
test ubuntu-latest nightly --no-default-features	34s
test ubuntu-latest nightly	38s
test ubuntu-latest nightly --all-features	38s
test ubuntu-latest 1.81 --no-default-features	27s
test ubuntu-latest 1.81	32s
test windows-latest stable --no-default-features	1m 31s
test windows-latest stable	1m 36s
test windows-latest stable --all-features	1m 30s
test windows-latest nightly --no-default-features	1m 28s
test windows-latest nightly	1m 31s
test windows-latest nightly --all-features	1m 30s
test windows-latest 1.81 --no-default-features	1m 8s
test windows-latest 1.81	1m 18s
deny / cargo deny check	19s
ci success	3s
	20m 24s

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