fix: default exports.require should be pointed to index-compat.js

[jkzing]

In latest version the default commonjs export was changed to ./dist/index.js via this config:

  "exports": {
    ".": {
      "import": "./dist/index.mjs",
      "require": "./dist/index.js"
    },
    "./package.json": "./package.json",
    "./": "./"
  },

This breaks use case like

require('cac')()

[egoist]

🎉 This PR is included in version 6.7.11 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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