fix: Add esm module type to package.json to resolve import errors

[BlakeSpiers]

Without the change, the importing of named exports causes errors with tsx;

import {
YoutubeTranscript,
} from "@danielxceron/youtube-transcript";

Causes:

SyntaxError: The requested module '@danielxceron/youtube-transcript' does not provide an export named 'YoutubeTranscript'
    at ModuleJob._instantiate (node:internal/modules/esm/module_job:226:21)
    at async ModuleJob.run (node:internal/modules/esm/module_job:335:5)
    at async onImport.tracePromise.__proto__ (node:internal/modules/esm/loader:665:26)
    at async asyncRunEntryPointWithESMLoader (node:internal/modules/run_main:117:5)