re-adding SqlClient

Author: brettsam

src/WebJobs.Script.WebHost/WebJobs.Script.WebHost.csproj

@@ -69,6 +69,8 @@
     <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="2.2.3" />
     <!-- The System.Interactive.Async assembly is required to be deployed. See https://github.com/Azure/azure-functions-host/issues/6203 -->
     <PackageReference Include="System.Interactive.Async" Version="3.2.0" />
+    <!-- The System.Data.SqlClient assembly is required to be deployed. -->
+    <PackageReference Include="System.Data.SqlClient" Version="4.3.1" />
     <PackageReference Include="System.Net.Primitives" Version="4.3.0" />
     <PackageReference Include="StyleCop.Analyzers" Version="1.1.0-beta004">
       <PrivateAssets>all</PrivateAssets>