Fix logging crashing when sending a non-json-able object

[7PH]

[12:05:43.921] INFO (7): Command received: xxxxx /message (length: 51)
[12:05:50.393] ERROR (7): WebSocket error from xxxxxxxxxxx: Error: Invalid WebSocket frame: invalid UTF-8 sequence
file:///workdir/build/server/skychat/Logging.js:4
        return args.map((a) => (typeof a === 'string' ? a : JSON.stringify(a))).join(' ');
                                                                 ^

TypeError: Converting circular structure to JSON
    --> starting at object with constructor 'Room'
    |     property 'connections' -> object with constructor 'Array'
    |     index 0 -> object with constructor 'Connection'
    --- property 'room' closes the circle
    at JSON.stringify (<anonymous>)
    at file:///workdir/build/server/skychat/Logging.js:4:66
    at Array.map (<anonymous>)
    at Logging.argsToString (file:///workdir/build/server/skychat/Logging.js:4:21)
    at Logging.error (file:///workdir/build/server/skychat/Logging.js:10:38)
    at Connection.<anonymous> (file:///workdir/build/server/skychat/Connection.js:165:21)
    at Generator.next (<anonymous>)
    at file:///workdir/build/server/skychat/Connection.js:7:71
    at new Promise (<anonymous>)
    at __awaiter (file:///workdir/build/server/skychat/Connection.js:3:12)

Node.js v22.16.0