Prepare the action runtime and development metadata for Node 24

[Copilot]

This updates the action’s declared runtime from Node 20 to Node 24 and aligns the repository metadata with that runtime shift. The change is intentionally narrow: runtime declaration, supporting type definitions, and the related documentation note.

• Runtime

  • Switch the action runtime in action.yml from node20 to node24 so hosted workflows execute the bundled action on the new Node major.

• Development metadata

  • Update @types/node in package.json and package-lock.json to the Node 24 line to keep local typechecking aligned with the declared action runtime.
  • Preserve existing dependency semantics in the lockfile while refreshing the resolved Node type package.

• Documentation

  • Update the README’s compatibility note to reflect Node 24 support.

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

[Copilot]

Pull request overview

Updates this repository’s GitHub Action runtime declaration and related development metadata to align with Node.js 24, ensuring the bundled JavaScript action runs under the newer Node major on hosted runners.

Changes:

• Switch action.yml runtime from node20 to node24.
• Update local typechecking alignment by moving @types/node to the Node 24 line in package.json and package-lock.json (including updated transitive undici-types).
• Refresh the README note to reflect Node 24 support.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
README.md	Updates the repository note to indicate Node 24 support.
package.json	Bumps @types/node devDependency to the Node 24 major line.
package-lock.json	Locks updated @types/node (and transitive undici-types) versions and metadata.
action.yml	Declares runs.using: node24 for the action runtime.

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