Update dependencies from https://github.com/dotnet/emsdk build 20210914.1 (#59264)

Microsoft.NET.Workload.Emscripten.Manifest-6.0.100
 From Version 6.0.0-rtm.21464.2 -> To Version 6.0.0-rc.2.21464.1

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

Author: dotnet-maestro[bot]

eng/Version.Details.xml

@@ -8,9 +8,9 @@
       <Uri>https://github.com/dotnet/msquic</Uri>
       <Sha>98129287d56a5e0348c291ce4260e630b4aa510d</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.NET.Workload.Emscripten.Manifest-6.0.100" Version="6.0.0-rtm.21464.2">
+    <Dependency Name="Microsoft.NET.Workload.Emscripten.Manifest-6.0.100" Version="6.0.0-rc.2.21464.1">
       <Uri>https://github.com/dotnet/emsdk</Uri>
-      <Sha>5cac15def164fc5ab593f8a0d3159dc51acd3cdd</Sha>
+      <Sha>9838ec0843442f761488cfec9cf34612c9f675e6</Sha>
     </Dependency>
   </ProductDependencies>
   <ToolsetDependencies>

eng/Versions.props

@@ -184,7 +184,7 @@
     <runtimeosx1012x64MicrosoftNETCoreRuntimeMonoLLVMSdkVersion>11.1.0-alpha.1.21416.1</runtimeosx1012x64MicrosoftNETCoreRuntimeMonoLLVMSdkVersion>
     <runtimeosx1012x64MicrosoftNETCoreRuntimeMonoLLVMToolsVersion>11.1.0-alpha.1.21416.1</runtimeosx1012x64MicrosoftNETCoreRuntimeMonoLLVMToolsVersion>
     <!-- emscripten / Node -->
-    <MicrosoftNETWorkloadEmscriptenManifest60100Version>6.0.0-rtm.21464.2</MicrosoftNETWorkloadEmscriptenManifest60100Version>
+    <MicrosoftNETWorkloadEmscriptenManifest60100Version>6.0.0-rc.2.21464.1</MicrosoftNETWorkloadEmscriptenManifest60100Version>
     <MicrosoftNETRuntimeEmscriptenVersion>$(MicrosoftNETWorkloadEmscriptenManifest60100Version)</MicrosoftNETRuntimeEmscriptenVersion>
     <!-- workloads -->
     <SwixPackageVersion>1.1.87-gba258badda</SwixPackageVersion>