Update action to use Node.js 20

[BhavyeMathur]

Using the action creates a deprecation warning:

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: test-room-7/action-update-file@v1. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.

Would be great if the Node.js version could be updated to avoid this.

Thanks!

[BhavyeMathur]

Looked at closed issue #18, let me see if I can create a similar pull request for this.