add missing ext

packages/misskey-js/test-d/api.ts

 import { expectType } from 'tsd';
-import * as Misskey from '../src';
+import * as Misskey from '../src/index.js';
 
 describe('API', () => {
 	test('success', async () => {

packages/misskey-js/test-d/streaming.ts

 import { expectType } from 'tsd';
-import * as Misskey from '../src';
+import * as Misskey from '../src/index.js';
 
 describe('Streaming', () => {
 	test('emit type', async () => {

packages/misskey-js/test/api.ts

 import { enableFetchMocks } from 'jest-fetch-mock';
-import { APIClient, isAPIError } from '../src/api';
+import { APIClient, isAPIError } from '../src/api.js';
 
 enableFetchMocks();
 

packages/misskey-js/test/streaming.ts

 import WS from 'jest-websocket-mock';
-import Stream from '../src/streaming';
+import Stream from '../src/streaming.js';
 
 describe('Streaming', () => {
 	test('useChannel', async () => {