Use htmltools github ref

Author: schloerke

pyproject.toml

@@ -33,7 +33,8 @@ dependencies = [
     "starlette",
     "websockets>=10.0",
     "python-multipart",
-    "htmltools>=0.5.3.9002",
+    # "htmltools>=0.5.3.9002",
+    "htmltools@git+https://github.com/posit-dev/py-htmltools@main",
     "click>=8.1.4;platform_system!='Emscripten'",
     "markdown-it-py>=1.1.0",
     "mdit-py-plugins>=0.3.0",