Update to ASP.NET Core 3.1.4

Author: SteveSandersonMS

Directory.Build.props

@@ -1,6 +1,6 @@
 <Project>
     <PropertyGroup>
-        <AspNetCoreVersion>3.1.3</AspNetCoreVersion>
+        <AspNetCoreVersion>3.1.4</AspNetCoreVersion>
         <BlazorVersion>3.2.0</BlazorVersion>
         <EntityFrameworkVersion>3.1.4</EntityFrameworkVersion>
         <SystemNetHttpJsonVersion>3.2.0</SystemNetHttpJsonVersion>