Bump `crypto-bigint` to v0.7.0-rc.27 (#661) #1235

Job	Run time
nightly	4m 37s
test (stable)	4m 50s
test (1.85.0)	5m 6s
build (1.85.0, wasm32-unknown-unknown)	26s
build (stable, wasm32-unknown-unknown)	26s
build (stable, thumbv7em-none-eabi)	24s
build (1.85.0, thumbv7em-none-eabi)	24s
minimal-versions	0s
	16m 13s

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