Update Arch Linux action username

This broke due to the username being changed, and GitHub does not appear
to put any redirects in place.

Author: code-asher

.github/workflows/publish.yaml

@@ -132,7 +132,7 @@ jobs:
           echo "VERSION=${TAG#v}" >> $GITHUB_ENV
 
       - name: Validate package
-        uses: hapakaien/archlinux-package-action@v2
+        uses: heyhusen/archlinux-package-action@v2
         env:
           VERSION: ${{ env.VERSION }}
         with: