Update dependencies from https://github.com/dotnet/icu build 20210819.2 (#57764)

Microsoft.NETCore.Runtime.ICU.Transport
 From Version 6.0.0-rc.1.21416.1 -> To Version 6.0.0-rc.2.21419.2

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

Author: dotnet-maestro[bot]

eng/Version.Details.xml

@@ -1,8 +1,8 @@
 <Dependencies>
   <ProductDependencies>
-    <Dependency Name="Microsoft.NETCore.Runtime.ICU.Transport" Version="6.0.0-rc.1.21416.1">
+    <Dependency Name="Microsoft.NETCore.Runtime.ICU.Transport" Version="6.0.0-rc.2.21419.2">
       <Uri>https://github.com/dotnet/icu</Uri>
-      <Sha>05dbba88d0ae799b4fea1e13c69b0c02beb7dcbe</Sha>
+      <Sha>2e5cc6f3c87a83cba41a5784840d8bbe198e3a45</Sha>
     </Dependency>
     <Dependency Name="System.Net.MsQuic.Transport" Version="6.0.0-preview.7.21417.1">
       <Uri>https://github.com/dotnet/msquic</Uri>

eng/Versions.props

@@ -172,7 +172,7 @@
     <MicrosoftNETILLinkTasksVersion>6.0.100-preview.6.21418.3</MicrosoftNETILLinkTasksVersion>
     <MicrosoftNETILLinkAnalyzerPackageVersion>$(MicrosoftNETILLinkTasksVersion)</MicrosoftNETILLinkAnalyzerPackageVersion>
     <!-- ICU -->
-    <MicrosoftNETCoreRuntimeICUTransportVersion>6.0.0-rc.1.21416.1</MicrosoftNETCoreRuntimeICUTransportVersion>
+    <MicrosoftNETCoreRuntimeICUTransportVersion>6.0.0-rc.2.21419.2</MicrosoftNETCoreRuntimeICUTransportVersion>
     <!-- MsQuic -->
     <SystemNetMsQuicTransportVersion>6.0.0-preview.7.21417.1</SystemNetMsQuicTransportVersion>
     <!-- Mono LLVM -->