deps: update buildkit, vendor changes

Signed-off-by: Jonathan A. Sternberg <jonathan.sternberg@docker.com>

vendor/golang.org/x/crypto/ssh/keys.go

@@ -1232,16 +1232,27 @@ func ParseRawPrivateKeyWithPassphrase(pemBytes, passphrase []byte) (interface{},
 		return nil, fmt.Errorf("ssh: cannot decode encrypted private keys: %v", err)
 	}
 
+	var result interface{}
+
 	switch block.Type {
 	case "RSA PRIVATE KEY":
-		return x509.ParsePKCS1PrivateKey(buf)
+		result, err = x509.ParsePKCS1PrivateKey(buf)
 	case "EC PRIVATE KEY":
-		return x509.ParseECPrivateKey(buf)
+		result, err = x509.ParseECPrivateKey(buf)
 	case "DSA PRIVATE KEY":
-		return ParseDSAPrivateKey(buf)
+		result, err = ParseDSAPrivateKey(buf)
 	default:
-		return nil, fmt.Errorf("ssh: unsupported key type %q", block.Type)
+		err = fmt.Errorf("ssh: unsupported key type %q", block.Type)
 	}
+	// Because of deficiencies in the format, DecryptPEMBlock does not always
+	// detect an incorrect password. In these cases decrypted DER bytes is
+	// random noise. If the parsing of the key returns an asn1.StructuralError
+	// we return x509.IncorrectPasswordError.
+	if _, ok := err.(asn1.StructuralError); ok {
+		return nil, x509.IncorrectPasswordError
+	}
+
+	return result, err
 }
 
 // ParseDSAPrivateKey returns a DSA private key from its ASN.1 DER encoding, as