upstream: Use private key that is allowed by sshd defaults in conch

interop tests.

ok dtucker@

OpenBSD-Regress-ID: 3b7f65c8f409c328bcd4b704f60cb3d31746f045

regress/conch-ciphers.sh

@@ -1,4 +1,4 @@
-#	$OpenBSD: conch-ciphers.sh,v 1.4 2019/07/05 04:12:46 dtucker Exp $
+#	$OpenBSD: conch-ciphers.sh,v 1.5 2023/10/23 11:30:49 anton Exp $
 #	Placed in the Public Domain.
 
 tid="conch ciphers"
@@ -16,7 +16,7 @@ for c in aes256-ctr aes256-cbc aes192-ctr aes192-cbc aes128-ctr aes128-cbc \
 	rm -f ${COPY}
 	# XXX the 2nd "cat" seems to be needed because of buggy FD handling
 	# in conch
-	${CONCH} --identity $OBJ/ssh-rsa --port $PORT --user $USER -e none \
+	${CONCH} --identity $OBJ/ssh-ed25519 --port $PORT --user $USER -e none \
 	    --known-hosts $OBJ/known_hosts --notty --noagent --nox11 -n \
 	    127.0.0.1 "cat ${DATA}" 2>/dev/null | cat > ${COPY}
 	if [ $? -ne 0 ]; then