Warning from OTP 27 - `format_status/2` is deprecated

```erlang
src/cgf_server.erl:26:2: Warning: the callback gen_server:format_status(_,_) is deprecated; use format_status/1 instead
%   26| -behaviour(gen_server).
%     |  ^
src/cgf_log_server.erl:27:2: Warning: the callback gen_server:format_status(_,_) is deprecated; use format_status/1 instead
%   27| -behaviour(gen_server).
%     |  ^
```