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Bump `crypto-bigint` to v0.7 final release #1259

Job	Run time
build (stable, wasm32-unknown-unknown)	27s
build (stable, thumbv7em-none-eabi)	24s
test (stable)	4m 48s
build (1.85.0, wasm32-unknown-unknown)	24s
build (1.85.0, thumbv7em-none-eabi)	25s
nightly	1m 9s
test (1.85.0)	5m 8s
minimal-versions	0s
	12m 45s