Update action to use `node20`

[MikeMcC399]

TL;DR

This is an enhancement request to provide a new version of google-github-actions/release-please-action which runs under node20 instead of under node16.

Detailed design

As a minimum the following needs to be updated from node16 to node20:

https://github.com/google-github-actions/release-please-action/blob/910801217bf1ec07dd4367e66345f83918f7ae57/action.yml#L170-L172

Additional information

The current release google-github-actions/release-please-action@v3.7.12 runs under node16.

The blog post GitHub Actions: Transitioning from Node 16 to Node 20 Sep 22, 2023 announces the deprecation process in GitHub Actions. Node.js 16 itself already entered end-of-life on Sep 11, 2023.

[MikeMcC399]

It would also be advisable to update internally-used GitHub Action workflows to use node20-compatible actions.

[MikeMcC399]

@chingor13

• I see that you completed PR feat!: require node20 for the action code #863 👍🏻

Do you plan a new release soon?

[MikeMcC399]

v4.0.0 includes support for node20.