fix(psk): add new supported ciphers to the conf template

rel/emqx_conf.template.en.md

@@ -314,7 +314,13 @@ ciphers =
     "RSA-PSK-AES128-GCM-SHA256",
     "RSA-PSK-AES128-CBC-SHA256",
     "RSA-PSK-AES256-CBC-SHA",
-    "RSA-PSK-AES128-CBC-SHA"
+    "RSA-PSK-AES128-CBC-SHA",
+    "PSK-AES256-GCM-SHA384",
+    "PSK-AES128-GCM-SHA256",
+    "PSK-AES256-CBC-SHA384",
+    "PSK-AES256-CBC-SHA",
+    "PSK-AES128-CBC-SHA256",
+    "PSK-AES128-CBC-SHA"
   ]
 ```
 

rel/emqx_conf.template.zh.md

@@ -292,6 +292,12 @@ ciphers = [
     "RSA-PSK-AES128-GCM-SHA256",
     "RSA-PSK-AES128-CBC-SHA256",
     "RSA-PSK-AES256-CBC-SHA",
-    "RSA-PSK-AES128-CBC-SHA"
+    "RSA-PSK-AES128-CBC-SHA",
+    "PSK-AES256-GCM-SHA384",
+    "PSK-AES128-GCM-SHA256",
+    "PSK-AES256-CBC-SHA384",
+    "PSK-AES256-CBC-SHA",
+    "PSK-AES128-CBC-SHA256",
+    "PSK-AES128-CBC-SHA"
   ]
 ```