Update i18n workflow files

Now, this requires some explanation.

Initially, we had the extract workflow, which did work. The problem is
that it can't commit to general-devel due to branch protection. If we
added a bypass that let it, though, it would enable anyone with write
access to this repository to write to general-devel (you can privilege
escalate easily).

Since we don't want that, this machine is setup:

1. TShock now triggers a workflow execution on a separate repo,
   hakusaro/tshock_i18n.
2. On hakusaro/tshock_i18n, a modified extraction script exists.
3. The modified extraction script, targeting tshock, downloads and runs
   itself.
4. @cardinal-system, a github user I control, creates and signs a commit
   and pushes it back to tshock, bypassing branch protection (because is
allowed to).

Now, nobody except me can modify the code that controls the system that
enables @cardinal-system to commit to tshock, preserving that security
element.

But how is the workflow in hakusaro/tshock_i18n triggered? Through
another workflow of course.

The issue is that triggering requires using...a PAT. Who's PAT? My PAT.
Github just launched fine-grained PATs, so I created a fine-grained PAT
scoped to only the hakusaro/tshock_i18n repo, and only workflow
dispatches.

There are other methods that could be used to technically perform this
triggering using a classic PAT, but they require the `repo` scope, which
would give anyone with write-access the ability to write to
hakusaro/tshock_i18n, which is clearly not-desired.

I was originally kinda stuck, thinking I'd have to make a fine-grained
PAT on @cardinal-system but that isn't supported yet (you can't scope a
fine-grained PAT to another user's repo yet -- only all of your repos or
the org's repos, not a collaborator's repo). But the new fine-grained
PAT system enables creating a PAT that just has a small, isolated set of
things tied to one user.

This is the safest option, I think.

The only catch is that the trigger PAT will expire on October 20, 2023,
so it has to be rotated yearly, like the nuget token
(https://github.com/Pryaxis/TShock/issues/2669).

Fun stuff.

.github/workflows/i18n-trigger.yaml

@@ -2,7 +2,6 @@ name: i18n check trigger
 on:
   push:
     branches: [ general-devel ]
-  workflow_dispatch:
 jobs:
   extract:
     runs-on: ubuntu-latest