Update dependencies from https://github.com/dotnet/arcade build 20210511.2 (#3580)

[main] Update dependencies from dotnet/arcade

eng/Version.Details.xml

@@ -80,9 +80,9 @@
       <Uri>https://github.com/dotnet/runtime</Uri>
       <Sha>05b646c85e2d3cfb0f95a4c700238a560477144a</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.DotNet.Arcade.Sdk" Version="6.0.0-beta.21257.5">
+    <Dependency Name="Microsoft.DotNet.Arcade.Sdk" Version="6.0.0-beta.21261.2">
       <Uri>https://github.com/dotnet/arcade</Uri>
-      <Sha>5faea1b7965644d1f1c666a7130f6f614abe76c0</Sha>
+      <Sha>1c6a2d9bb8d111720e69b133bf630a38bb136509</Sha>
     </Dependency>
   </ToolsetDependencies>
 </Dependencies>

global.json

@@ -18,7 +18,7 @@
     "version": "6.0.100-preview.3.21202.5"
   },
   "msbuild-sdks": {
-    "Microsoft.DotNet.Arcade.Sdk": "6.0.0-beta.21257.5",
+    "Microsoft.DotNet.Arcade.Sdk": "6.0.0-beta.21261.2",
     "Yarn.MSBuild": "1.22.10"
   }
 }