Bump `crypto-bigint` to v0.6.0-rc.5 #717

Job	Run time
build (1.73.0, thumbv7em-none-eabi)	21s
doc	36s
test (1.73.0)	28s
test (stable)	3m 33s
build (1.73.0, wasm32-unknown-unknown)	23s
build (stable, thumbv7em-none-eabi)	15s
build (stable, wasm32-unknown-unknown)	16s
	5m 52s

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