Update Microsoft.AspNetCore.SpaServices.Extensions to latest 3.1.9

Author: liborpansky

AspNetCoreVueStarter.csproj

@@ -19,7 +19,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.AspNetCore.SpaServices.Extensions" Version="3.1.8" />
+    <PackageReference Include="Microsoft.AspNetCore.SpaServices.Extensions" Version="3.1.9" />
     <PackageReference Include="VueCliMiddleware" Version="3.1.2" />
   </ItemGroup>