Update dependencies from https://github.com/dotnet/extensions build 20230821.4 (#50368)

[main] Update dependencies from dotnet/extensions

Author: dotnet-maestro[bot]

eng/Version.Details.xml

@@ -388,9 +388,9 @@
       <Uri>https://github.com/dotnet/arcade</Uri>
       <Sha>90c167d5c57de4a8bced566379dbd893556c94e8</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.Extensions.Telemetry.Testing" Version="8.0.0-rc.2.23421.8">
+    <Dependency Name="Microsoft.Extensions.Telemetry.Testing" Version="9.0.0-alpha.1.23421.4">
       <Uri>https://github.com/dotnet/extensions</Uri>
-      <Sha>30dc2c0878042e9b29c32daf74a55c8c06ddc598</Sha>
+      <Sha>a387e38dc927035db5492b47e9607867da7d5005</Sha>
     </Dependency>
     <Dependency Name="NuGet.Frameworks" Version="6.2.4">
       <Uri>https://github.com/nuget/nuget.client</Uri>

eng/Versions.props

@@ -137,7 +137,7 @@
     <SystemIOHashingVersion>8.0.0-rc.1.23421.3</SystemIOHashingVersion>
     <SystemRuntimeCachingVersion>8.0.0-rc.1.23421.3</SystemRuntimeCachingVersion>
     <!-- Packages from dotnet/extensions -->
-    <MicrosoftExtensionsTelemetryTestingVersion>8.0.0-rc.2.23421.8</MicrosoftExtensionsTelemetryTestingVersion>
+    <MicrosoftExtensionsTelemetryTestingVersion>9.0.0-alpha.1.23421.4</MicrosoftExtensionsTelemetryTestingVersion>
     <!-- Packages from dotnet/efcore -->
     <dotnetefVersion>9.0.0-alpha.1.23421.9</dotnetefVersion>
     <MicrosoftEntityFrameworkCoreInMemoryVersion>9.0.0-alpha.1.23421.9</MicrosoftEntityFrameworkCoreInMemoryVersion>