Doesn't support reading in `jest-puppeteer.config.cjs` by default

[cpiber]

🐛 Bug Report

jest-puppeteer doesn't support ES Module config files; In type: module packages it should therefore find jest-puppeteer.config.cjs instead.

To Reproduce

Steps to reproduce the behavior:

• Create a package and put "type": "module" in package.json
• Create jest-puppeteer.config.cjs with configuration

Expected behavior

Reads config from jest-puppeteer.config.cjs.

Run npx envinfo --system --binaries --npmPackages expect-puppeteer,jest-dev-server,jest-environment-puppeteer,jest-puppeteer,spawnd --markdown --clipboard

Paste the results here:

## System:
 - OS: Linux 5.4 Ubuntu 20.04.3 LTS (Focal Fossa)
 - CPU: (8) x64 Intel(R) Core(TM) i7-7700 CPU @ 3.60GHz
 - Memory: 3.52 GB / 15.60 GB
 - Container: Yes
 - Shell: 5.8 - /usr/bin/zsh
## Binaries:
 - Node: 15.14.0 - /usr/bin/node
 - Yarn: 1.22.5 - /usr/bin/yarn
 - npm: 7.7.6 - /usr/bin/npm
## npmPackages:
 - jest-puppeteer: ^6.0.0 => 6.0.0