[main] Update dependencies from dotnet/xharness (#24033)

This pull request updates the following dependencies

## From https://github.com/dotnet/xharness

- **Subscription**: [02e03784-16b3-4ced-b02a-3715797fc7da](https://maestro.dot.net/subscriptions?search=02e03784-16b3-4ced-b02a-3715797fc7da)
- **Build**: [20251016.4](https://dev.azure.com/dnceng/internal/_build/results?buildId=2817731) ([287470](https://maestro.dot.net/channel/2/github:dotnet:xharness/build/287470))
- **Date Produced**: October 16, 2025 4:27:04 PM UTC
- **Commit**: [88399512021dfa8b5f45d91f84c8ce6f0959b127](dotnet/xharness@8839951)
- **Branch**: [main](https://github.com/dotnet/xharness/tree/main)

- **Updates**:
  - From [10.0.0-prerelease.25513.3 to 10.0.0-prerelease.25516.4][1]
     - Microsoft.DotNet.XHarness.iOS.Shared

[1]: dotnet/xharness@47d2875...8839951

Author: dotnet-maestro[bot]

eng/Version.Details.props

@@ -32,7 +32,7 @@ This file should be imported by eng/Versions.props
     <MicrosoftDotNetBuildTasksFeedPackageVersion>10.0.0-beta.25513.2</MicrosoftDotNetBuildTasksFeedPackageVersion>
     <MicrosoftDotNetSharedFrameworkSdkPackageVersion>10.0.0-beta.25513.2</MicrosoftDotNetSharedFrameworkSdkPackageVersion>
     <!-- dotnet/xharness dependencies -->
-    <MicrosoftDotNetXHarnessiOSSharedPackageVersion>10.0.0-prerelease.25513.3</MicrosoftDotNetXHarnessiOSSharedPackageVersion>
+    <MicrosoftDotNetXHarnessiOSSharedPackageVersion>10.0.0-prerelease.25516.4</MicrosoftDotNetXHarnessiOSSharedPackageVersion>
   </PropertyGroup>
   <!--Property group for alternate package version names-->
   <PropertyGroup>

eng/Version.Details.xml

@@ -90,9 +90,9 @@
       <Uri>https://github.com/dotnet/dotnet</Uri>
       <Sha>0b60d265d30d96c827b73dbce74cb78f600d3c92</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.DotNet.XHarness.iOS.Shared" Version="10.0.0-prerelease.25513.3">
+    <Dependency Name="Microsoft.DotNet.XHarness.iOS.Shared" Version="10.0.0-prerelease.25516.4">
       <Uri>https://github.com/dotnet/xharness</Uri>
-      <Sha>47d2875bd1eacb26e5c4b06a5fe3fc15186e2ae4</Sha>
+      <Sha>88399512021dfa8b5f45d91f84c8ce6f0959b127</Sha>
     </Dependency>
     <Dependency Name="Microsoft.DotNet.Arcade.Sdk" Version="10.0.0-beta.25513.2">
       <Uri>https://github.com/dotnet/arcade</Uri>