aead

elliptic-curve: bump `crypto-bigint` to v0.6.0-pre.12 #2231

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	2m 13s
test (1.65.0)	2m 19s
build (1.65.0, wasm32-unknown-unknown)	2m 16s
test (stable)	17s
build (stable, thumbv7em-none-eabi)	16s
build (stable, wasm32-unknown-unknown)	15s
	7m 36s

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