Bump `crypto-bigint` to 0.6.0-pre.5 #122

Job	Run time
clippy	2m 15s
codecov	43s
build-wasm (1.73.0, wasm32-unknown-unknown)	17s
build-benchmarks	2m 29s
build-wasm (stable, wasm32-unknown-unknown)	12s
rustfmt	5s
slow-tests (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	3m 1s
tests (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	57s
slow-tests (x86_64-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	2m 54s
tests (x86_64-unknown-linux-gnu, stable)	30s
	13m 23s

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