bash-f: minor tweaks #250

Job	Run time
minimal-versions / minimal-versions	26s
test-simd	18s
miri (s390x-unknown-linux-gnu)	1m 4s
miri (x86_64-unknown-linux-gnu)	47s
set-msrv / set-msrv	5s
build (stable, thumbv7em-none-eabi)	15s
build (1.85.0, thumbv7em-none-eabi)	17s
build (stable, wasm32-unknown-unknown)	13s
build (1.85.0, wasm32-unknown-unknown)	15s
test (1.85.0)	17s
test (stable)	14s
aarch64-sha3 (1.85.0)	39s
aarch64-sha3 (stable)	36s
	5m 26s

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