fix(utxo-lib): always verify ECDSA in strict mode
fix(utxo-lib): always verify ECDSA in strict mode

Per consensus rules, signatures must have a lower-S value

See https://github.com/bitcoin/bips/blob/master/bip-0146.mediawiki for
details.

This change replaces the indirect call to `ecc.verify()` inside
`ECPair.verify()`[^1] with a direct call that sets the last argument
`strict` to `true`.

Note that this strict (low-S) verification is the default in the
`noble-secp256k1` library, which is the prospective secp256k1 library
going forward.

Issue: BG-44787
[^1]: https://github.com/bitcoinjs/ecpair/blob/d35a64c/ts_src/ecpair.ts#L215
[^2]: https://github.com/paulmillr/noble-secp256k1/blob/97aa518/index.ts#L1212

BitGo/BitGoJS,BitGo/BitGoJS,BitGo/BitGoJS,BitGo/BitGoJS