[main] Update dependencies from dotnet/xharness (#27043)

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**: [20261026.1](https://dev.azure.com/dnceng/internal/_build/results?buildId=3117082) ([338331](https://maestro.dot.net/channel/2/github:dotnet:xharness/build/338331))
- **Date Produced**: October 26, 2026 10:03:24 AM UTC
- **Commit**: [d8aa5d5189e5d31a49a45e671ddee21216fc4607](dotnet/xharness@d8aa5d5)
- **Branch**: [main](https://github.com/dotnet/xharness/tree/main)

- **Dependency Updates**:
  - From [11.0.0-prerelease.26517.1 to 11.0.0-prerelease.26526.1][1]
     - Microsoft.DotNet.XHarness.iOS.Shared

[1]: dotnet/xharness@38ed208...d8aa5d5

Author: dotnet-maestro[bot]

eng/Version.Details.props

@@ -30,7 +30,7 @@ This file should be imported by eng/Versions.props
     <MicrosofttvOSSdknet100_265PackageVersion>26.5.10322</MicrosofttvOSSdknet100_265PackageVersion>
     <MicrosofttvOSSdknet100_270PackageVersion>27.0.10722</MicrosofttvOSSdknet100_270PackageVersion>
     <!-- dotnet-xharness dependencies -->
-    <MicrosoftDotNetXHarnessiOSSharedPackageVersion>11.0.0-prerelease.26517.1</MicrosoftDotNetXHarnessiOSSharedPackageVersion>
+    <MicrosoftDotNetXHarnessiOSSharedPackageVersion>11.0.0-prerelease.26526.1</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>e1fc22dd641fa857d198afa8ec4c96eac1ac7f29</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.DotNet.XHarness.iOS.Shared" Version="11.0.0-prerelease.26517.1">
+    <Dependency Name="Microsoft.DotNet.XHarness.iOS.Shared" Version="11.0.0-prerelease.26526.1">
       <Uri>https://github.com/dotnet/xharness</Uri>
-      <Sha>38ed2081279c3f4dee81c933aaa9721b50a44adb</Sha>
+      <Sha>d8aa5d5189e5d31a49a45e671ddee21216fc4607</Sha>
     </Dependency>
     <Dependency Name="Microsoft.DotNet.Arcade.Sdk" Version="12.0.0-beta.26513.123">
       <Uri>https://github.com/dotnet/dotnet</Uri>