Release: Fix path to gem

The gem artifact isn't in the pkg/ subfolder, it's in the root dir.

Author: bastelfreak

.github/workflows/release.yaml

@@ -38,4 +38,4 @@ jobs:
         shell: bash
         env:
           GH_TOKEN: ${{ github.token }}
-        run: gh release upload ${{ github.ref_name }} pkg/*.gem
+        run: gh release upload ${{ github.ref_name }} *.gem