Node 20

[AdriVanHoudt]

Hi,

Is there a plan to update to use node 20?
We're starting to see these warnings on CI.
Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: SpicyPizza/create-envfile@v2.0. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.

I think this mainly needs an update here: https://github.com/SpicyPizza/create-envfile/blob/main/action.yml#L21
But bumping some CI packages and config like #164 and https://github.com/SpicyPizza/create-envfile/blob/main/.github/workflows/check-dist.yml#L29 can probably help.