Fix wierd Nested tranaction problem out of nowhere

Author: alex-kulakov

Orm/Xtensive.Orm.MySql/Xtensive.Orm.MySql.csproj

@@ -17,7 +17,7 @@
     <WarningLevel>2</WarningLevel>
   </PropertyGroup>
   <ItemGroup Condition="'$(TargetFramework)'=='netstandard2.0'">
-    <PackageReference Include="MySql.Data" Version="6.10.4" />
+    <PackageReference Include="MySql.Data" Version="6.10.7" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\Xtensive.Orm\Xtensive.Orm.csproj" />