Revert version change for now

Author: pamelafox

articles/app-service/tutorial-python-postgresql-app.md

@@ -124,7 +124,7 @@ Sign in to the [Azure portal](https://portal.azure.com/) and follow these steps
         1. *Resource Group* → Select **Create new** and use a name of **msdocs-python-postgres-tutorial**.
         1. *Region* → Any Azure region near you.
         1. *Name* → **msdocs-python-postgres-XYZ** where *XYZ* is any three random characters. This name must be unique across Azure.
-        1. *Runtime stack* → **Python 3.10**.
+        1. *Runtime stack* → **Python 3.9**.
         1. *Database* →  **PostgreSQL - Flexible Server** is selected by default as the database engine. The server name and database name is also set by default to appropriate values.
         1. *Hosting plan* → **Basic**. When you're ready, you can [scale up](manage-scale-up.md) to a production pricing tier later.
         1. Select **Review + create**.