test: bump up jest to v27 that introduces new defaults (#315)

The jest-circus is now default runner, no need to depend on it explicitly.
The testEnvironment also changed its default to "node".
Also types/jest is now needless, we can use jest/globals instead.
https://jestjs.io/blog/2021/05/25/jest-27

jest.config.js

@@ -1,9 +1,7 @@
 module.exports = {
   clearMocks: true,
   moduleFileExtensions: ['js', 'ts'],
-  testEnvironment: 'node',
   testMatch: ['**/*.test.ts'],
-  testRunner: 'jest-circus/runner',
   transform: {
     '^.+\\.ts$': 'ts-jest'
   },