deps: upgrade multi-approvers action runtime to Node 24 (Node 20 deprecation)

[Capstan]

Description

The multi-approvers GitHub Action is currently triggering deprecation warnings on runner environments because it is configured to use the Node 20 runtime.

GitHub has announced that:

• June 16, 2026: Actions will be forced to run with Node 24 by default.
• September 16, 2026: Node 20 will be completely removed from the runner environments.

We are currently seeing this warning in downstream workflows using the action:

Node.js 20 actions are deprecated. The following actions are running on Node.js 20 and may not work as expected: ...

Proposed Solution

1. Manually bump the execution runtime in .github/actions/multi-approvers/action.yml to use Node 24:

   runs:
     using: 'node24'
     main: 'dist/index.js'

2. Re-compile the action code under Node 24 (using @vercel/ncc as configured in your build script) and run the test suite (npm test) to ensure compatibility.
3. Release/push the compiled change so downstream consumers can update their pinned SHAs to a Node 24-compatible version before the June 16, 2026 deadline.

[Capstan]

Suggested Labels: dependencies, bug