add support for sql server 2022 (#202)

Windows CI has not been changed to 2022 yet.

Author: mShan0

azure-pipelines.yml

@@ -131,8 +131,8 @@ jobs:
         displayName: Use Python $(python.version)
 
       - script: |
-          docker pull mcr.microsoft.com/mssql/server:2019-latest
-          docker run -e 'ACCEPT_EULA=Y' -e 'SA_PASSWORD=$(TestAppPassword)' -p 1433:1433 -d mcr.microsoft.com/mssql/server:2019-latest
+          docker pull mcr.microsoft.com/mssql/server:2022-latest
+          docker run -e 'ACCEPT_EULA=Y' -e 'SA_PASSWORD=$(TestAppPassword)' -p 1433:1433 -d mcr.microsoft.com/mssql/server:2022-latest
           curl https://packages.microsoft.com/keys/microsoft.asc | sudo apt-key add -
           curl https://packages.microsoft.com/config/ubuntu/20.04/prod.list | sudo tee /etc/apt/sources.list.d/mssql-release.list
           sudo apt-get update

mssql/base.py

@@ -192,6 +192,7 @@ class DatabaseWrapper(BaseDatabaseWrapper):
         13: 2016,
         14: 2017,
         15: 2019,
+        16: 2022,
     }
 
     # https://azure.microsoft.com/en-us/documentation/articles/sql-database-develop-csharp-retry-windows/