Use dev shiny branch for faster debugging

Author: schloerke

.github/workflows/shiny.yaml

@@ -15,7 +15,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
         with:
-          repository: posit-dev/py-shiny
+          repository: posit-dev/py-shiny@htmltools_type_changes
           fetch-depth: 0 # Required for shiny version
       - name: Setup py-shiny@main
         id: install