Fix /requests api 500 error

[kingster]

Fixes serialisation issue of bytes

/api/v1/bins/<binname>/requests now returns proper json

[
    {
        "id": "1lt7h8",
        "time": 1739281716.091676,
        "remote_addr": "127.0.0.1",
        "method": "POST",
        "headers": {
            "Host": "localhost:8000",
            "User-Agent": "curl/8.7.1",
            "Accept": "*/*",
            "Content-Length": "9",
            "Content-Type": "application/x-www-form-urlencoded"
        },
        "query_string": {},
        "raw": "fizz=buzz",
        "form_data": [
            [
                "fizz",
                "buzz"
            ]
        ],
        "body": "",
        "path": "/bs63vg25",
        "content_length": 9,
        "content_type": "application/x-www-form-urlencoded"
    }
]