Convert from CommonJS to ESM

[Copilot]

Convert from CommonJS to ESM

• Add "type": "module" to package.json to enable ESM
• Convert all require() statements to import statements in main.js
  • Changed const core = require('@actions/core') to import core from '@actions/core'
  • Changed const exec = require('@actions/exec') to import exec from '@actions/exec'
  • Changed const github = require('@actions/github') to import github from '@actions/github'
  • Changed const artifact = require('@actions/artifact') to import artifact from '@actions/artifact'
  • Changed const AdmZip = require('adm-zip') to import AdmZip from 'adm-zip'
  • Changed const filesize = require('filesize') to import { filesize } from 'filesize' (named export)
  • Changed const pathname = require('path') to import pathname from 'node:path' (with node: prefix)
  • Changed const fs = require('fs') to import fs from 'node:fs' (with node: prefix)
• Used node: protocol prefix for built-in modules (best practice for ESM)
• Fixed undeclared variable filtered - added const declaration (ESM strict mode requirement)
• Fixed filesize function calls from filesize.filesize() to filesize() (named import)
• Verified ESM imports work correctly with Node.js 20
• Verified no syntax errors with node --check main.js
• All CI issues resolved

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[dawidd6]

@copilot CI failed, please fix

[Copilot]

@copilot CI failed, please fix

Fixed in commits 3e1c740 and e56b1fd. The CI failure was caused by two ESM strict mode issues:

1. Undeclared variable filtered (required const declaration)
2. Incorrect filesize.filesize() calls (should be filesize() for named import)