JSON attachments are not displayed correctly after upgrade to 3.6.1 (Cucumber 10+) due to broken decoding

[HannaTarasevich]

Environment (please complete the following information):

• multiple-cucumber-html-reporter: 3.6.1
• Node.js version: 20.9.0
• NPM version: 10.2.5
• Platform name and version: Windows 10
• Cucumber version: 10.3.1

Config of multiple-cucumber-html-reporter

    if(fs.existsSync('./reports/json-output-folder')){
        // Generate the report when it all tests are done
        generate({
            // Required
            // This part needs to be the same path where you store the JSON files
            // default = '.tmp/json/'
            jsonDir: './reports/json-output-folder',
            reportPath: './reports/report',
            displayDuration: true,
            openReportInBrowser: false,
            durationInMS: false
            // for more options see https://github.com/wswebcreation/multiple-cucumber-html-reporter#options
        });
    }

Describe the bug
When JSON object is encoded to base64 in json, the reporter does not decode it properly. The data is displayed in as buffer type.

To Reproduce
Steps to reproduce the behavior:
https://github.com/HannaTarasevich/multiple-reporter-issue

1. npm install
2. npm run wdio
3. open generated report (reports > report > index.html) and open any test > show info

Expected behavior
Data is decoded to a valid JSON object.