Update dependency Microsoft.VisualStudio.Web.CodeGeneration.Design to v3.1.5

Author: renovate[bot]

CSharpApp/CSharpApp.csproj

@@ -10,7 +10,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation" Version="3.0.0" />
     <PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="3.0.0" />
-    <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="3.0.0" />
+    <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="3.1.5" />
     <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
   </ItemGroup>