Modernize release workflow to eliminate Node 20 and set‑output deprecations

[Copilot]

The release workflow emitted deprecation warnings for Node.js 20–based actions and set-output usage. This update refreshes the release pipeline to supported actions and removes the deprecated release/upload flow while preserving the draft release behavior.

• Workflow action updates

  • Move to actions/checkout@v4 and actions/setup-node@v4.
  • Opt into Node.js 24 for JS actions and set the runner to Node 24.

• Release publishing

  • Replace actions/create-release@v1 + actions/upload-release-asset@v1 with softprops/action-gh-release@v2 and attach the userscript directly.

Example (new release step):

- name: Create GitHub Release
  uses: softprops/action-gh-release@v2
  with:
    tag_name: ${{ github.ref_name }}
    name: ${{ github.ref_name }}
    draft: true
    files: |
      dist/inskewl.user.js

[Copilot]

Pull request overview

This PR updates the GitHub Actions release workflow to remove deprecation warnings by modernizing action versions, moving the build to Node.js 24, and switching to a single-step GitHub Release + asset upload action while keeping releases as drafts.

Changes:

• Upgraded actions/checkout and actions/setup-node to @v4 and set the build Node.js version to 24.
• Replaced actions/create-release + actions/upload-release-asset with softprops/action-gh-release@v2, attaching dist/inskewl.user.js directly.
• Added a job-level env var intended to force JavaScript actions onto Node 24.

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