chore: migrate code to ESM (#73)

node_modules/undici/lib/api/index.js

@@ -1,7 +0,0 @@
-'use strict'
-
-module.exports.request = require('./api-request')
-module.exports.stream = require('./api-stream')
-module.exports.pipeline = require('./api-pipeline')
-module.exports.upgrade = require('./api-upgrade')
-module.exports.connect = require('./api-connect')