ci: add WPT updater

[Uzlopak]

fixes #3164

Will then look like this:

Uzlopak#4

Currently set to daily updates. If we dont merge it, and there are changes, it will force-push into the existing PR branch.

[KhafraDev]

I believe the action versions have to be scoped to a commit hash, but I'll let someone who's more familiar handle that if it's required.

[Uzlopak]

Using now commit hashes

[mcollina]

lgtm