fix: opt-in to keep stdout #5919

Job	Run time
docs	1m 5s
check no_std	22s
clippy	47s
doctest	1m 10s
feature-checks	3m 48s
feature-propagation	57s
fmt	13s
wasm-wasi	1m 31s
wasm-unknown	57s
test ubuntu-latest stable --no-default-features	1m 27s
test ubuntu-latest stable	1m 45s
test ubuntu-latest stable --all-features	2m 26s
test ubuntu-latest nightly --no-default-features	1m 11s
test ubuntu-latest nightly	1m 57s
test ubuntu-latest nightly --all-features	2m 7s
test ubuntu-latest 1.81 --no-default-features	56s
test ubuntu-latest 1.81	1m 6s
test windows-latest stable --no-default-features	3m 51s
test windows-latest stable	3m 28s
test windows-latest stable --all-features	3m 52s
test windows-latest nightly --no-default-features	3m 14s
test windows-latest nightly	3m 28s
test windows-latest nightly --all-features	3m 52s
test windows-latest 1.81 --no-default-features	2m 41s
test windows-latest 1.81	3m 14s
deny / cargo deny check	21s
ci success	1s
	51m 47s

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