Switch to ESM and Upgrade @actions/cache

[luckyabsoluter]

close #572

This pull request modernizes the project's configuration and codebase to fully support ECMAScript modules (ESM), updates dependencies, and introduces a tool version manager configuration. The most significant changes are grouped below:

Migration to ECMAScript Modules (ESM):

• To support @actions/cache version ^6.0.0
• Converted eslint.config.js from CommonJS (require/module.exports) to ESM (import/export default) syntax.
• Added "type": "module" to package.json to enable ESM support throughout the project.
• Updated internal imports in src/installer.ts and src/main.ts to use explicit .js extensions, as required by ESM. [1] [2]

Dependency Updates:

• Upgraded @actions/cache dependency in package.json from ^3.2.4 to ^6.0.0.

Tooling Configuration:

• Added a mise.toml file to specify Node.js version 20 for development environment consistency. (Node 20 is End-of-Life. Upgrading to Node 22 is strongly recommended!)

Test

Before

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After First

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After Second

[luckyabsoluter]

workaround: nttld/setup-ndk@5bc54e77d3f78364d4e333b1c8eedcf9414c5e64

[raftario]

Closed in favour of #575 which should be available as a tag by the time you read this :)