chore: use decred secp256k1 directly #1245
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Use
github.com/decred/dcrd/dcrec/secp256k1/v4
directly rather thangithub.com/btcsuite/btcd/btcec/v2
which is just a wrapper around the underlying decred library. Inspired by ethereum/go-ethereum#30595github.com/btcsuite/btcd/btcec/v2
has a very annoying breaking change when upgrading from v2.3.3 to v2.3.4. The easiest way to work around this is to remove the wrapper.