Update dependencies from https://github.com/dotnet/arcade build 20190806.7 (#3837)

- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.19406.7

eng/Version.Details.xml

@@ -65,9 +65,9 @@
     </Dependency>
   </ProductDependencies>
   <ToolsetDependencies>
-    <Dependency Name="Microsoft.DotNet.Arcade.Sdk" Version="1.0.0-beta.19405.9">
+    <Dependency Name="Microsoft.DotNet.Arcade.Sdk" Version="1.0.0-beta.19406.7">
       <Uri>https://github.com/dotnet/arcade</Uri>
-      <Sha>44ccf0f527de559b07f9ad955a47ec97f03f2146</Sha>
+      <Sha>c155e609f88491128e1a66d09f413062f3344d4b</Sha>
     </Dependency>
   </ToolsetDependencies>
 </Dependencies>

eng/common/templates/post-build/post-build.yml

@@ -52,6 +52,7 @@ stages:
             filePath: eng\common\sdk-task.ps1
             arguments: -task SigningValidation -restore -msbuildEngine dotnet
               /p:PackageBasePath='$(Build.ArtifactStagingDirectory)/PackageArtifacts'
+              /p:SignCheckExclusionsFile='$(Build.SourcesDirectory)/eng/SignCheckExclusionsFile.txt'
               /p:Configuration=Release
 
   - ${{ if eq(parameters.enableSourceLinkValidation, 'true') }}:

global.json

@@ -3,6 +3,6 @@
     "dotnet": "3.0.100-preview6-012264"
   },
   "msbuild-sdks": {
-    "Microsoft.DotNet.Arcade.Sdk": "1.0.0-beta.19405.9"
+    "Microsoft.DotNet.Arcade.Sdk": "1.0.0-beta.19406.7"
   }
 }