Require min version of shiny, not a git dependency

Author: cpsievert

setup.cfg

@@ -34,8 +34,7 @@ setup_requires =
 install_requires =
     ipywidgets>=7.6.5
     jupyter_core
-    # shiny>=0.6.1.9003
-    shiny @ git+https://github.com/posit-dev/py-shiny.git
+    shiny>=0.6.1.9004
     python-dateutil>=2.8.2
     # Needed because of https://github.com/python/importlib_metadata/issues/411
     importlib-metadata>=4.8.3,<5; python_version < "3.8"