Update EC certs to use NIST-256 and NIST-384
diff --git a/tests/data_files/server6.key b/tests/data_files/server6.key
index 9b582dc..1311cfa 100644
--- a/tests/data_files/server6.key
+++ b/tests/data_files/server6.key
@@ -1,5 +1,5 @@
 -----BEGIN EC PRIVATE KEY-----
-MF8CAQEEGD5d3O02N8S/dSjU0RmPK8h2TEH64xPN6qAKBggqhkjOPQMBAaE0AzIA
-BBNrCG0mTkhIp2TN6tjDDsvHoDPGPQQHLLsMTvVKUtQfJ0/btdW7404eVUAICQFP
-jg==
+MHcCAQEEIEQZG5j8IkRLxa9OoZJzD3KkrXqIgi9cHZMVv2s/VcPOoAoGCCqGSM49
+AwEHoUQDQgAEgVkxdkkk+hWtq6Axbg7tMxH6kSVVwbDBnANyPpi6LaRyN4kfQzeN
+H4462PBX6C9PyQCk99tzD7LGBJTRQDs44w==
 -----END EC PRIVATE KEY-----