chore(go.mod): move yeet to be a go tool (#485)

This means that yeet's version will be managed by `go.mod` and
auto-bumped with dependabot. This removes human error from the equation
and ensures that Anubis is always built with the newest version of yeet.

This also makes it trivial to make your own local packages for testing:

```text
go tool yeet
```

Signed-off-by: Xe Iaso <me@xeiaso.net>

.github/workflows/package-builds-stable.yml

@@ -64,10 +64,7 @@ jobs:
 
     - name: Build Packages
       run: |
-        wget https://github.com/TecharoHQ/yeet/releases/download/v0.2.2/yeet_0.2.2_amd64.deb -O var/yeet.deb
-        sudo apt -y install -f ./var/yeet.deb
-        rm ./var/yeet.deb
-        yeet
+        go tool yeet
 
     - name: Upload released artifacts
       env: