Update dependencies from https://github.com/dotnet/roslyn build 20200807.3 (#24738)

[master] Update dependencies from dotnet/roslyn
- Updates:
  - Microsoft.Net.Compilers.Toolset: from 3.8.0-2.20379.3 to 3.8.0-2.20407.3

Author: dotnet-maestro[bot]

eng/Version.Details.xml

@@ -313,9 +313,9 @@
       <Uri>https://github.com/dotnet/arcade</Uri>
       <Sha>7385e2722b9fa517314aa5db1fa598a8d417b3c7</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.Net.Compilers.Toolset" Version="3.8.0-2.20379.3">
+    <Dependency Name="Microsoft.Net.Compilers.Toolset" Version="3.8.0-2.20407.3">
       <Uri>https://github.com/dotnet/roslyn</Uri>
-      <Sha>7238563e5c051535770a9266c45d925012ad2b76</Sha>
+      <Sha>dba2fa57432b4bd9cc7880e2c6fe3acdd01bba3c</Sha>
     </Dependency>
   </ToolsetDependencies>
 </Dependencies>

eng/Versions.props

@@ -62,7 +62,7 @@
   -->
   <PropertyGroup Label="Automated">
     <!-- Packages from dotnet/roslyn -->
-    <MicrosoftNetCompilersToolsetPackageVersion>3.8.0-2.20379.3</MicrosoftNetCompilersToolsetPackageVersion>
+    <MicrosoftNetCompilersToolsetPackageVersion>3.8.0-2.20407.3</MicrosoftNetCompilersToolsetPackageVersion>
     <!-- Packages from dotnet/runtime -->
     <MicrosoftExtensionsDependencyModelPackageVersion>5.0.0-rc.1.20409.3</MicrosoftExtensionsDependencyModelPackageVersion>
     <MicrosoftNETCoreAppInternalPackageVersion>5.0.0-rc.1.20409.3</MicrosoftNETCoreAppInternalPackageVersion>