fix: update Node.js runtime from 20 to 24 (#217)

GitHub Actions is deprecating Node.js 20 runners, with Node.js 24
becoming the forced default on June 2nd, 2026.

- Update `action.yml` runtime from `node20` to `node24`

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<details>

<summary>Original prompt</summary>

> 
> ----
> 
> *This section details on the original issue you should resolve*
> 
> <issue_title>Needs update from Node.js 20 to 24</issue_title>
> <issue_description>As of latest I'm getting this:
> 
> Node.js 20 actions are deprecated. The following actions are running
on Node.js 20 and may not work as expected:
styfle/cancel-workflow-action@0.13.0. Actions will be forced to run with
Node.js 24 by default starting June 2nd, 2026. Please check if updated
versions of these actions are available that support Node.js 24. To opt
into Node.js 24 now, set the FORCE_JAVASCRIPT_ACTIONS_TO_NODE24=true
environment variable on the runner or in your workflow file. Once
Node.js 24 becomes the default, you can temporarily opt out by setting
ACTIONS_ALLOW_USE_UNSECURE_NODE_VERSION=true. For more information see:
https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/</issue_description>
> 
> <agent_instructions>Update from Node.js 20 to 24</agent_instructions>
> 
> ## Comments on the Issue (you are @copilot in this section)
> 
> <comments>
> </comments>
> 


</details>



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- Fixes #216

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: styfle <229881+styfle@users.noreply.github.com>

Author: Copilot

action.yml

@@ -28,5 +28,5 @@ inputs:
     required: false
     default: 'false'
 runs:
-  using: 'node20'
+  using: 'node24'
   main: 'dist/index.js'