Make SqlServdr.csproj compilabe for .NET7

Author: SergeiPavlov

Orm/Xtensive.Orm.SqlServer/Xtensive.Orm.SqlServer.csproj

@@ -18,7 +18,7 @@
   <ItemGroup Condition="'$(TargetFramework)'=='net5.0'">
     <PackageReference Include="Microsoft.Data.SqlClient" Version="5.0.0" />
   </ItemGroup>
-  <ItemGroup Condition="'$(TargetFramework)'=='net6.0'">
+  <ItemGroup Condition="'$(TargetFramework)'!='net5.0'">
     <PackageReference Include="Microsoft.Data.SqlClient" Version="5.1.0" />
   </ItemGroup>
   <ItemGroup>