update action to Node 20 and bump packages

[Djontleman]

Problem

Node 16 actions are deprecated. This action should be updated to Node 20.

Changes

• Update action and workflows to use Node 20
• Update dependencies (see comment)
• Remove unused files

## Testing

Tested in my own fork after merging the same changes (https://github.com/Djontleman/workflow-dispatch/pull/1).

Workflow run: https://github.com/Djontleman/workflow-dispatch/actions/runs/8785890431

[Djontleman]

Hi @aurelien-baudet, would you be able to review?

[StummeJ]

@Djontleman given this repo looks abandoned, could you tag this in your repo as v4, v4.0, and v4.0.0?

[Djontleman]

I have created v4, v4.0 and v4.0.0 tags: https://github.com/Djontleman/workflow-dispatch/releases/tag/v4.0.0 I haven't published to Marketplace though, not sure on the etiquette here.

[aurelien-baudet]

Sorry, I have no more time and energy to maintain this repository. I even don't have computer anymore. Someone of you should for this repository and merge the different pull requests. Tell me who creates the fork and I will archive this repository but indicate which repository follows up

[fbiesse]

@Djontleman I wanted to know if you're planning to take over on this action. If not, I propose to create a fork, update readme, integrate your developments and maintain it. Tell me

[Djontleman]

Hi @fbiesse I don't plan to maintain this. I'm happy for you to if you're up for it.

[VincentLanglet]

Hi, FYI https://github.com/benc-uk/workflow-dispatch/issues/73