(RC2) Downgrade to LTS SqlClient (#34540)

* Update to LTS SqlClient

* Bump

Author: ajcvickers

src/EFCore.SqlServer/EFCore.SqlServer.csproj

@@ -49,7 +49,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Data.SqlClient" Version="5.2.1" />
+    <PackageReference Include="Microsoft.Data.SqlClient" Version="5.1.6" />
   </ItemGroup>
 
   <ItemGroup>