CI: Update SQL Server to version 2022 (#7069)

|      Q       |   A
|------------- | -----------
| Type         | improvement
| Fixed issues | N/A

#### Summary

Let's see if we can run the test suite against a more recent version of
SQL Server.

Author: derrabus

.github/workflows/phpunit-sqlserver.yml

@@ -19,7 +19,7 @@ jobs:
 
     services:
       sqlserver:
-        image: mcr.microsoft.com/mssql/server:2019-latest
+        image: mcr.microsoft.com/mssql/server:2022-latest
         ports:
           - '1433:1433'
         env: