Bump `elliptic-curve` crate to v0.14.0-pre.2 #599

Job	Run time
build (1.73.0, thumbv7em-none-eabi)	19s
build (1.73.0, wasm32-unknown-unknown)	20s
test (1.73.0)	27s
build (stable, thumbv7em-none-eabi)	16s
test (stable)	18s
build (stable, wasm32-unknown-unknown)	12s
doc	44s
	2m 36s

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