nginxサンプルでTLSv1.2以外をdropなど (#6298)

docs/examples/misskey.nginx

@@ -39,8 +39,8 @@ server {
     #ssl_certificate_key /etc/ssl/private/ssl-cert-snakeoil.key;
 
     # SSL protocol settings
-    ssl_protocols TLSv1 TLSv1.2;
-    ssl_ciphers ECDHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-SHA:ECDHE-RSA-AES128-SHA:AES128-SHA;
+    ssl_protocols TLSv1.2;
+    ssl_ciphers ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-SHA:ECDHE-RSA-AES128-SHA:AES128-SHA;
     ssl_prefer_server_ciphers on;
 
     # Change to your upload limit