Update dependencies from https://github.com/dotnet/arcade build 20201215.4 (#3014)

[master] Update dependencies from dotnet/arcade

eng/Version.Details.xml

@@ -3,17 +3,17 @@
   <ProductDependencies>
   </ProductDependencies>
   <ToolsetDependencies>
-    <Dependency Name="Microsoft.DotNet.Arcade.Sdk" Version="6.0.0-beta.20614.8">
+    <Dependency Name="Microsoft.DotNet.Arcade.Sdk" Version="6.0.0-beta.20615.4">
       <Uri>https://github.com/dotnet/arcade</Uri>
-      <Sha>b2d5bf0342fa65d70ed2c3ddbdb3841d7ca0b382</Sha>
+      <Sha>7d638bb082f374f7c8ddbada79f757662df4a246</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.DotNet.Helix.Sdk" Version="6.0.0-beta.20614.8">
+    <Dependency Name="Microsoft.DotNet.Helix.Sdk" Version="6.0.0-beta.20615.4">
       <Uri>https://github.com/dotnet/arcade</Uri>
-      <Sha>b2d5bf0342fa65d70ed2c3ddbdb3841d7ca0b382</Sha>
+      <Sha>7d638bb082f374f7c8ddbada79f757662df4a246</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.DotNet.GenAPI" Version="6.0.0-beta.20614.8">
+    <Dependency Name="Microsoft.DotNet.GenAPI" Version="6.0.0-beta.20615.4">
       <Uri>https://github.com/dotnet/arcade</Uri>
-      <Sha>b2d5bf0342fa65d70ed2c3ddbdb3841d7ca0b382</Sha>
+      <Sha>7d638bb082f374f7c8ddbada79f757662df4a246</Sha>
     </Dependency>
   </ToolsetDependencies>
 </Dependencies>

eng/Versions.props

@@ -18,6 +18,6 @@
     <SnVersion>1.0.0</SnVersion>
     <VSWhereVersion>2.5.2</VSWhereVersion>
     <MicroBuildCoreVersion>0.2.0</MicroBuildCoreVersion>
-    <MicrosoftDotNetGenAPIVersion>6.0.0-beta.20614.8</MicrosoftDotNetGenAPIVersion>
+    <MicrosoftDotNetGenAPIVersion>6.0.0-beta.20615.4</MicrosoftDotNetGenAPIVersion>
   </PropertyGroup>
 </Project>

global.json

@@ -9,7 +9,7 @@
     }
   },
   "msbuild-sdks": {
-    "Microsoft.DotNet.Arcade.Sdk": "6.0.0-beta.20614.8",
-    "Microsoft.DotNet.Helix.Sdk": "6.0.0-beta.20614.8"
+    "Microsoft.DotNet.Arcade.Sdk": "6.0.0-beta.20615.4",
+    "Microsoft.DotNet.Helix.Sdk": "6.0.0-beta.20615.4"
   }
 }