Memory leak

[rthreei]

Memory leak as reported by jest --detectLeaks.

Steps to reproduce:

1. git clone [email protected]:gribnoysup/setup-polly-jest.git
2. npm install
3. npm install weak-napi (required jest --detectLeaks)
4. npx jest -c ./test/jest-circus-integration.config.json --verbose --detectLeaks

Output:

 FAIL  test/integration/jest-common/test-skip.test.js
  ● Test suite failed to run

    EXPERIMENTAL FEATURE!
    Your test suite is leaking memory. Please ensure all references are cleaned.

    There is a number of things that can leak memory:
      - Async operations that have not finished (e.g. fs.readFile).
      - Timers not properly mocked (e.g. setInterval, setTimeout).
      - Keeping references to the global scope.

      at onResult (node_modules/@jest/core/build/TestScheduler.js:190:18)
          at Array.map (<anonymous>)