Adding System.Data.Common to nuspec & netfx reference project

Author: MichelZ

src/Microsoft.Data.SqlClient/netfx/ref/Microsoft.Data.SqlClient.csproj

@@ -27,5 +27,6 @@
   <ItemGroup>
     <PackageReference Include="Azure.Identity" Version="$(AzureIdentityVersion)" />
     <PackageReference Include="System.Text.Json" Version="$(SystemTextJsonVersion)" />
+    <PackageReference Include="System.Data.Common" Version="$(SystemDataCommonVersion)" />
   </ItemGroup>
 </Project>

tools/specs/Microsoft.Data.SqlClient.nuspec

@@ -37,6 +37,7 @@ When using NuGet 3.x this package requires at least version 3.4.</description>
         <dependency id="System.Buffers" version="4.5.1" />
         <dependency id="System.Text.Encodings.Web" version="6.0.0" />
         <dependency id="System.Text.Json" version="6.0.10" />
+        <dependency id="System.Data.Common" version="4.3.0" />
       </group>
       <group targetFramework="net8.0">
         <dependency id="Microsoft.Data.SqlClient.SNI.runtime" version="6.0.0-preview1.24226.4" exclude="Compile" />