chore!: bump Forge to v8

[SpacingBat3]

Important

The current patchset is for testing purposes only and will most likely be fully rebased once Electron Forge v8.0.0 will be released. Please bear that in mind this means a like-hood of doing a force push (this branch, not master)!
For that reason, this PR will remain draft until everything will be in-place to work on releasing it.

This patchset aims to bump Forge to v8 and eventually fix any major breakages on the way.

Checklist

• Confirm tests pass for supported Node environments and stable components (currently maker-appimage only), both remotely and locally.
• Confirm if everything works in practice locally (via example), additionally validating initial development stage components (plugin-launcher).
• Confirm everything stays backwards-compatible (it'll probably stay if there are no code changes necessary) and plan strategy for backwards-incompatible API. Edit: PR is marked as breaking due to Forge types incompatibilities – this needs to be reflected in package.json to depend only on newer Forge version.
• Wait for Forge 8 stabilization
• Reflect breakages in dependency management
• Set dependency boundaries to stable Forge 8.

Related

Upstream issue ticket: electron/forge#4082

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[achou11]

Sorry for the random comment, but a friendly notice that Forge v8 has been released (although lacking in documentation it seems...)

[SpacingBat3]

Yeah, I've seen it, I just didn't have time to consolidate changes there on repo and switch to stable releases to ensure nothing breaking was introduced. Also:

(…) although lacking in documentation it seems… (…)

Just to clear things out since I was contributing towards Forge for the docs, the new docs are there, just the links to docs are broken since their CI script just merges the old docs and new ones changed due to Typedoc update in Forge 8. I saw other PR being involved in some doc switch to docsaurus so things on doc front are I think still WIP, there might not be code that releases new manually-written doc pages but dynamic ones at https://js.electronforge.io/ should already be deployed.