Remove open-file limit in systemd service

rspamd.service

@@ -3,6 +3,7 @@ Description=rapid spam filtering system
 After=nss-lookup.target
 
 [Service]
+LimitNOFILE=infinity
 NonBlocking=true
 ExecStart=/usr/bin/rspamd -c /etc/rspamd/rspamd.conf -f
 User=_rspamd