[Rspamd] Set fixed name for fuzzy store

data/conf/rspamd/local.d/fuzzy_check.conf

@@ -29,7 +29,7 @@ rule "local" {
 
 rule "mailcow" {
     # Fuzzy storage server list
-    servers = "95.217.129.125:11445";
+    servers = "fuzzy.mailcow.email:11445";
     # Default symbol for unknown flags
     symbol = "MAILCOW_FUZZY_UNKNOWN";
     # Additional mime types to store/check