chore(deps): allow multiple versions of secp256k1 #3562

Job	Run time
check serde	20s
check no-default-features	18s
check std	17s
clippy	1m 26s
docs	1m 16s
test no_std	19s
test stable --no-default-features	1m 23s
fmt	7s
test stable	1m 27s
test stable --all-features	1m 37s
test beta --no-default-features	2m 29s
test beta	2m 26s
test beta --all-features	2m 38s
test nightly --no-default-features	2m 9s
test nightly	2m 20s
test nightly --all-features	2m 22s
	22m 54s

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