🆙 Update for Node 16 support

[stoe]

This pull request includes several updates to the codebase, focusing on modernizing dependencies, improving configurations, and refactoring code for better maintainability and readability. The most important changes include updates to ESLint and Prettier configurations, workflow adjustments, package updates, and refactoring of the codebase to use ES modules.

Configuration and Dependency Updates:

• .eslintrc.json: Updated ecmaVersion to 2020 and sourceType to module. Adjusted ESLint rules for camelcase and added no-console rule. [1] [2]
• .github/workflows/codeql.yml: Added environment variables and updated actions to specific commit hashes.
• .github/workflows/test.yml: Updated Node.js version matrix to use 20.x.
• action.yml: Updated Node.js version to 20 for the action runtime.
• package.json: Added type: "module", updated dependencies and devDependencies, and modified scripts for better compatibility and performance. [1] [2]

Code Migration to ES Modules:

• src/index.js: Refactored to use ES module syntax and updated imports accordingly. [1] [2]
• src/report.js: Converted to ES module and updated import statements. [1] [2] [3]

Testing and Linting:

• tests/index.t.js: Removed the old CommonJS-based test file.
• tests/report.t.js: Updated to use ES module syntax and adjusted mocks accordingly. [1] [2]

Other Changes:

• .prettierrc.cjs: Added ESLint directive and required Prettier configuration from eslint-plugin-github.
• Removed prettier.config.js as it is now included in .prettierrc.cjs.

[stoe]

Next step after merge: Create new release!

[gclhub]

@stoe I saw that you already have a PR to a newer nodeJS version in this repo, so I added a couple of suggestions to upgrade to node v20 in response to the prompt from @stebje to upgrade the ActionsDesk repositories.

[gclhub]

LGTM