Bump `crypto-bigint` to 0.6.0-pre.5 #119

Job	Run time
build-benchmarks	2m 30s
codecov	44s
clippy	2m 15s
build-wasm (1.73.0, wasm32-unknown-unknown)	19s
rustfmt	7s
build-wasm (stable, wasm32-unknown-unknown)	11s
slow-tests (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	2m 28s
slow-tests (x86_64-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	2m 49s
tests (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	1m 8s
tests (x86_64-unknown-linux-gnu, stable)	41s
	13m 12s

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