Revert "Change SQL Server docker image to 2019."

This reverts commit 63a140a.

Author: mo-esmp

tests/Serilog.Ui.MsSqlServerProvider.Tests/Util/MsSqlServerTestProvider.cs

@@ -1,4 +1,5 @@
-using Dapper;
+using System.Threading.Tasks;
+using Dapper;
 using DotNet.Testcontainers.Builders;
 using DotNet.Testcontainers.Containers;
 using Microsoft.Data.SqlClient;
@@ -9,7 +10,6 @@
 using Serilog.Ui.Core.Extensions;
 using Serilog.Ui.MsSqlServerProvider;
 using Serilog.Ui.MsSqlServerProvider.Extensions;
-using System.Threading.Tasks;
 using Testcontainers.MsSql;
 using Xunit;
 
@@ -32,7 +32,6 @@ protected MsSqlServerTestProvider()
             .ForUnixContainer()
             .UntilCommandIsCompleted("/opt/mssql-tools18/bin/sqlcmd", "-C", "-Q", "SELECT 1;");
         Container = new MsSqlBuilder()
-            .WithImage("mcr.microsoft.com/mssql/server:2019-lates")
             .WithWaitStrategy(waitStrategy)
             .Build();
     }