Update dependencies from https://github.com/aspnet/AspNetCore-Tooling build 20190909.7 (#2774)

- Microsoft.NET.Sdk.Razor - 3.1.0-alpha1.19459.7

Author: dotnet-maestro[bot]

eng/Version.Details.xml

@@ -25,9 +25,9 @@
       <Uri>https://github.com/dotnet/roslyn</Uri>
       <Sha>f5ba9f2c61a2fe853dc4913888d40df221539147</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.NET.Sdk.Razor" Version="3.1.0-alpha1.19459.4">
+    <Dependency Name="Microsoft.NET.Sdk.Razor" Version="3.1.0-alpha1.19459.7">
       <Uri>https://github.com/aspnet/AspNetCore-Tooling</Uri>
-      <Sha>a89628cf613f3849f6194ed710516b2124466194</Sha>
+      <Sha>c823a7fc59da0643341cb6e305f3e7de9abbe407</Sha>
     </Dependency>
     <!-- For coherency purposes, this version should be gated by the version of wpf routed via core setup -->
     <Dependency Name="Microsoft.NET.Sdk.WindowsDesktop" Version="3.0.0-rc1.19459.3" CoherentParentDependency="Microsoft.NETCore.App">

eng/Versions.props

@@ -37,7 +37,7 @@
   </PropertyGroup>
   <PropertyGroup>
     <!-- Dependencies from https://github.com/aspnet/AspNetCore-Tooling -->
-    <MicrosoftNETSdkRazorPackageVersion>3.1.0-alpha1.19459.4</MicrosoftNETSdkRazorPackageVersion>
+    <MicrosoftNETSdkRazorPackageVersion>3.1.0-alpha1.19459.7</MicrosoftNETSdkRazorPackageVersion>
   </PropertyGroup>
   <PropertyGroup>
     <!-- Dependencies from https://github.com/aspnet/websdk -->