feat(canary): implement canary update checker + small ci change

[Preloading]

This makes the check for updates function compatible with canary builds, thru the github actions API. Also fixes a small thing that was bugging me with actions.

Also does some misc. changes to how Geckium checks release updates.

[Preloading]

probably fixed the merge conflict. let me know if something went wrong with it

[angelbruni]

Actually, maybe it's better if the updater gets reworked first..... hm...............

[dominichayesferen]

In the relatively unused Updater module, there is hints of being able to update between different Geckium branches, so considering Canary is a branch of its own because'a you, it may be wise to scrap this and take what you did, work with bruni, and rework the existing updater mechanism to allow the following, using your work here:

• Branch switching via Geckium Settings...?
• Updating the very placeholdery way depending on the currently selected branch (falling back to the one in version.json if not manually overridden, ig)

[Preloading]

Canary is a branch of its own

Canary isn't really a branch of it's own. In the future, Canary can be used to build separate branches (and possibly PRs for testing them).