Bump `crypto-bigint` to v0.6.0-rc.5 #331

Job	Run time
build (1.73.0, thumbv7em-none-eabi)	21s
build (1.73.0, wasm32-unknown-unknown)	20s
cross (armv7-unknown-linux-gnueabihf, 1.73.0)	1m 47s
build (stable, thumbv7em-none-eabi)	15s
cross (armv7-unknown-linux-gnueabihf, stable)	1m 45s
build (stable, wasm32-unknown-unknown)	15s
cross (aarch64-unknown-linux-gnu, 1.73.0)	1m 25s
cross (aarch64-unknown-linux-gnu, stable)	1m 9s
doc	58s
cross (powerpc-unknown-linux-gnu, 1.73.0)	1m 30s
cross (powerpc-unknown-linux-gnu, stable)	1m 27s
test (i686-unknown-linux-gnu, 1.73.0, sudo apt update && sudo apt install gcc-multilib)	1m 33s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	1m 17s
test (x86_64-unknown-linux-gnu, 1.73.0)	1m 16s
test (x86_64-unknown-linux-gnu, stable)	1m 3s
	16m 21s

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