Update dependencies from https://github.com/dotnet/symreader build 20231221.1 (#53004)

Microsoft.SourceBuild.Intermediate.symreader
 From Version 2.1.0-beta.23615.1 -> To Version 2.1.0-beta.23621.1

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

Author: dotnet-maestro[bot]

eng/Version.Details.xml

@@ -412,9 +412,9 @@
       <Uri>https://github.com/nuget/nuget.client</Uri>
       <Sha>8fef55f5a55a3b4f2c96cd1a9b5ddc51d4b927f8</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.SourceBuild.Intermediate.symreader" Version="2.1.0-beta.23615.1">
+    <Dependency Name="Microsoft.SourceBuild.Intermediate.symreader" Version="2.1.0-beta.23621.1">
       <Uri>https://github.com/dotnet/symreader</Uri>
-      <Sha>236d6c586677394a698d79fb2ff8e60bcc41ab0c</Sha>
+      <Sha>6b058bf0b8942460db4f0ef953e8a0e44db0474c</Sha>
       <SourceBuild RepoName="symreader" ManagedOnly="true" />
     </Dependency>
   </ToolsetDependencies>

eng/Versions.props

@@ -168,7 +168,7 @@
     <!-- Packages from dotnet/source-build-reference-packages -->
     <MicrosoftSourceBuildIntermediatesourcebuildreferencepackagesVersion>9.0.0-alpha.1.23627.2</MicrosoftSourceBuildIntermediatesourcebuildreferencepackagesVersion>
     <!-- Packages from dotnet/symreader -->
-    <MicrosoftSourceBuildIntermediatesymreaderVersion>2.1.0-beta.23615.1</MicrosoftSourceBuildIntermediatesymreaderVersion>
+    <MicrosoftSourceBuildIntermediatesymreaderVersion>2.1.0-beta.23621.1</MicrosoftSourceBuildIntermediatesymreaderVersion>
     <!-- Packages from dotnet/winforms -->
     <SystemDrawingCommonVersion>9.0.0-alpha.1.23630.1</SystemDrawingCommonVersion>
     <!-- Packages from dotnet/xdt -->