secp256k1proto: deserialize x-only-pk with from_bytes_xonly (schnorr_verify)

If the passed x-only-pubkey overflows (x >= p), this method fails
immediately rather than silently wrapping around and then likely
failing later (either because x % p is not on the curve or because the
actual signature verification fails). For the user of `schnorr_verify`
this shouldn't make any difference, as `False` is returned with both
variants, so this is probably more of a cosmetic change.

Author: theStack

python/secp256k1proto/bip340.py

@@ -56,7 +56,7 @@ def schnorr_verify(
     if len(sig) != 64:
         raise ValueError("The signature must be a 64-byte array.")
     try:
-        P = GE.lift_x(int_from_bytes(pubkey))
+        P = GE.from_bytes_xonly(pubkey)
     except ValueError:
         return False
     r = int_from_bytes(sig[0:32])