chore: updating buttler action for itch.io

Author: kerodekroma

.github/workflows/publish_itchio.yml

@@ -21,6 +21,7 @@ jobs:
           uses: remarkablegames/setup-butler@v2
 
         - name: Upload to itch.io
-          run: butler push python_pygame_loader_demo.zip kerodekroma/python-pygame-loader:html --userversion ${{ steps.download-html.outputs.version }}
+          run: butler push python_pygame_loader_demo.zip kerodekroma/python-pygame-loader:html --userversion ${{ env.BUNDLE_VERSION }}
           env:
+            BUNDLE_VERSION: ${{ steps.download-html.outputs.version }}
             BUTLER_API_KEY: ${{ secrets.BUTLER_CREDENTIALS }}