[main] Update dependencies from dotnet/arcade (#1623)

* Update dependencies from https://github.com/dotnet/arcade build 20210819.2

Microsoft.DotNet.Arcade.Sdk
 From Version 6.0.0-beta.21418.12 -> To Version 6.0.0-beta.21419.2

* Update dependencies from https://github.com/dotnet/arcade build 20210820.4

Microsoft.DotNet.Arcade.Sdk
 From Version 6.0.0-beta.21418.12 -> To Version 6.0.0-beta.21420.4

Co-authored-by: dotnet-maestro[bot] <dotnet-maestro[bot]@users.noreply.github.com>

eng/Version.Details.xml

@@ -1,9 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Dependencies>
   <ToolsetDependencies>
-    <Dependency Name="Microsoft.DotNet.Arcade.Sdk" Version="6.0.0-beta.21418.12">
+    <Dependency Name="Microsoft.DotNet.Arcade.Sdk" Version="6.0.0-beta.21420.4">
       <Uri>https://github.com/dotnet/arcade</Uri>
-      <Sha>ac8b7514ca8bcac1d071a16b7a92cb52f7058871</Sha>
+      <Sha>fe787bd48ed72e51a98eb5e4e5e5af74edb531e5</Sha>
     </Dependency>
   </ToolsetDependencies>
 </Dependencies>

eng/common/init-tools-native.sh

@@ -10,7 +10,7 @@ force=false
 download_retries=5
 retry_wait_time_seconds=30
 global_json_file="$(dirname "$(dirname "${scriptroot}")")/global.json"
-declare -A native_assets
+declare -a native_assets
 
 . $scriptroot/pipeline-logging-functions.sh
 . $scriptroot/native/common-library.sh

eng/common/native/common-library.sh

@@ -148,8 +148,12 @@ function NewScriptShim {
   fi
   
   if [[ ! -f $tool_file_path ]]; then
-    Write-PipelineTelemetryError -category 'NativeToolsBootstrap' "Specified tool file path:'$tool_file_path' does not exist"
-    return 1
+    # try to see if the path is lower cased
+    tool_file_path="$(echo $tool_file_path | tr "[:upper:]" "[:lower:]")" 
+    if [[ ! -f $tool_file_path ]]; then
+      Write-PipelineTelemetryError -category 'NativeToolsBootstrap' "Specified tool file path:'$tool_file_path' does not exist"
+      return 1
+    fi
   fi
 
   local shim_contents=$'#!/usr/bin/env bash\n'

global.json

@@ -3,7 +3,7 @@
     "dotnet": "6.0.100-rc.1.21379.2"
   },
   "msbuild-sdks": {
-    "Microsoft.DotNet.Arcade.Sdk": "6.0.0-beta.21418.12"
+    "Microsoft.DotNet.Arcade.Sdk": "6.0.0-beta.21420.4"
   },
   "sdk": {
     "version": "6.0.100-rc.1.21379.2",