web-api(fix): share tokens provided as arguments in files upload to upload jobs

Summary

This PR passes any token provided to the options of files.uploadV2 with upload jobs for multiple files to prevent an unexpected not_authed error.

This is the error that's thrown when using the example code below!

```sh /Users/me/programming/tools/node-slack-sdk/packages/web-api/dist/errors.js:62 const error = errorWithCode(new Error(`An API error occurred: ${result.error}`), ErrorCode.PlatformError); ^ Error: An API error occurred: not_authed at platformErrorFromResult (/Users/me/programming/tools/node-slack-sdk/packages/web-api/dist/errors.js:62:33) at WebClient. (/Users/me/programming/tools/node-slack-sdk/packages/web-api/dist/WebClient.js:198:60) at Generator.next () at fulfilled (/Users/me/programming/tools/node-slack-sdk/packages/web-api/dist/WebClient.js:28:58) at process.processTicksAndRejections (node:internal/process/task_queues:95:5) { code: 'slack_webapi_platform_error', data: { ok: false, error: 'not_authed', response_metadata: { acceptedScopes: [ 'files:write:user' ] } } } ```

Reviewers

Experiment and experience all this has to offer with the following snippet:

(async () => {
    const result = await web.files.uploadV2({
        channel_id: "C0123456789",
        token: "xoxb-0123456789-ABCDEF-GHIJKLMNOP-QRSTUVWXYZ",
        file_uploads: [{
            content: "hello world",
            filename: "GREETINGS.txt",
        }]
    });
    console.log(result);
})();

Requirements

[x] I've read and understood the Contributing Guidelines and have done my best effort to follow them.
[x] I've read and agree to the Code of Conduct.

slackapi / node-slack-sdk