message: fix(utxo-lib): pass buffer to `hash256`
  The `utxolib.crypto.*` are essentially wrappers around nodes
  `crypto.createHash` interface.
  Strings are converted to buffers with `utf8` encoding by default.
  Issue:
diff: @@ -1043,7 +1043,7 @@ export class Xlm extends BaseCoin {
  * @param entropySeed random seed which is hashed to generate the derivation path
  */
  deriveKeyWithSeed({ key, seed }: { key: string; seed: string }): { derivationPath: string; key: string } {
  - const derivationPathInput = utxolib.crypto.hash256(`${seed}` as any).toString('hex');
  + const derivationPathInput = utxolib.crypto.hash256(Buffer.from(seed, 'utf8')).toString('hex');
  const derivationPathParts = [
  999999,
  parseInt(derivationPathInput.slice(0, 7), 16),
  