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Bump arbitrary from 1.4.2 to 1.5.0 #480

Job	Run time
miri (x86_64-unknown-linux-gnu)	54s
clippy	26s
rustfmt	15s
miri (s390x-unknown-linux-gnu)	1m 17s
build (1.85.0, wasm32-unknown-unknown)	1m 6s
test (stable)	46s
doc	18s
build (1.85.0, armv7a-none-eabi)	1m 22s
build (stable, wasm32-unknown-unknown)	1m 1s
coverage	26s
build (1.85.0, thumbv7em-none-eabi)	1m 28s
test (1.85.0)	50s
build (stable, thumbv7em-none-eabi)	1m 7s
build (stable, armv7a-none-eabi)	1m 9s
careful	1m 2s
	13m 27s