Tests need to be fixed

[aegilops]

Since I updated to Node 20, the tests are not functioning.

The Action works end-to-end, I validated that, but the unit tests with Jest are not working due to an error I wasn't familiar enough with to resolve.

[felickz]

Eslint needs migrated as well

[felickz]

Fixed with #111

• 31789e4

Enable full ESM support for Node 20+ and modern dependencies, update Jest and build output configuration

• Set "type": "module" in package.json to enable ESM throughout the project.
• Changed "main" in package.json to "dist/index.js" to point to the bundled output generated by ncc.
• Updated Jest configuration (jest.config.js) to ESM format and to use babel-jest for TypeScript transformation.
• Added/updated babel.config.js in ESM format to support TypeScript and ESM for Jest.
• Ensured test scripts use NODE_OPTIONS=--experimental-vm-modules for Jest ESM compatibility.