Update dependencies from https://github.com/dotnet/extensions build 20250510.2

Microsoft.Extensions.Diagnostics.Testing , Microsoft.Extensions.TimeProvider.Testing
 From Version 9.5.0-preview.1.25252.3 -> To Version 9.6.0-preview.1.25260.2

Author: dotnet-maestro[bot]

eng/Version.Details.xml

@@ -396,13 +396,13 @@
       <Uri>https://github.com/dotnet/dotnet</Uri>
       <Sha>5e6dacd4d3debda3266224b2a434811c6fa94987</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.Extensions.Diagnostics.Testing" Version="9.5.0-preview.1.25252.3">
+    <Dependency Name="Microsoft.Extensions.Diagnostics.Testing" Version="9.6.0-preview.1.25260.2">
       <Uri>https://github.com/dotnet/extensions</Uri>
-      <Sha>9652f798f2de4e40c088075d00d185628c8e3dbb</Sha>
+      <Sha>90dd3fdbb6056d8ae177ab102b779e3922a88981</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.Extensions.TimeProvider.Testing" Version="9.5.0-preview.1.25252.3">
+    <Dependency Name="Microsoft.Extensions.TimeProvider.Testing" Version="9.6.0-preview.1.25260.2">
       <Uri>https://github.com/dotnet/extensions</Uri>
-      <Sha>9652f798f2de4e40c088075d00d185628c8e3dbb</Sha>
+      <Sha>90dd3fdbb6056d8ae177ab102b779e3922a88981</Sha>
     </Dependency>
     <Dependency Name="NuGet.Frameworks" Version="6.2.4">
       <Uri>https://github.com/nuget/nuget.client</Uri>

eng/Versions.props

@@ -144,8 +144,8 @@
     <SystemNumericsTensorsVersion>10.0.0-preview.5.25257.101</SystemNumericsTensorsVersion>
     <SystemRuntimeCachingVersion>10.0.0-preview.5.25257.101</SystemRuntimeCachingVersion>
     <!-- Packages from dotnet/extensions -->
-    <MicrosoftExtensionsDiagnosticsTestingVersion>9.5.0-preview.1.25252.3</MicrosoftExtensionsDiagnosticsTestingVersion>
-    <MicrosoftExtensionsTimeProviderTestingVersion>9.5.0-preview.1.25252.3</MicrosoftExtensionsTimeProviderTestingVersion>
+    <MicrosoftExtensionsDiagnosticsTestingVersion>9.6.0-preview.1.25260.2</MicrosoftExtensionsDiagnosticsTestingVersion>
+    <MicrosoftExtensionsTimeProviderTestingVersion>9.6.0-preview.1.25260.2</MicrosoftExtensionsTimeProviderTestingVersion>
     <!-- Packages from dotnet/efcore -->
     <dotnetefVersion>10.0.0-preview.5.25257.101</dotnetefVersion>
     <MicrosoftEntityFrameworkCoreInMemoryVersion>10.0.0-preview.5.25257.101</MicrosoftEntityFrameworkCoreInMemoryVersion>