Change renegotiation tests to work with TLS 1.2 only

Signed-off-by: Waleed Elmelegy <waleed.elmelegy@arm.com>
diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index 10d75a7..5f0daaa 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -5530,7 +5530,7 @@
 requires_config_enabled MBEDTLS_SSL_PROTO_TLS1_2
 run_test    "Renegotiation: gnutls server strict, client-initiated" \
             "$G_SRV --priority=NORMAL:-VERS-ALL:+VERS-TLS1.2:%SAFE_RENEGOTIATION" \
-            "$P_CLI debug_level=3 exchanges=1 renegotiation=1 renegotiate=1" \
+            "$P_CLI force_version=tls12 debug_level=3 exchanges=1 renegotiation=1 renegotiate=1" \
             0 \
             -c "client hello, adding renegotiation extension" \
             -c "found renegotiation extension" \
@@ -5649,7 +5649,7 @@
 requires_config_enabled MBEDTLS_SSL_PROTO_TLS1_2
 run_test    "Renego ext: gnutls server strict, client default" \
             "$G_SRV --priority=NORMAL:-VERS-ALL:+VERS-TLS1.2:%SAFE_RENEGOTIATION" \
-            "$P_CLI debug_level=3" \
+            "$P_CLI force_version=tls12 debug_level=3" \
             0 \
             -c "found renegotiation extension" \
             -C "error" \