[main] Update dependencies from dotnet/arcade

[dotnet-maestro]

This pull request updates the following dependencies

From https://github.com/dotnet/arcade

• Subscription: c2897f6e-d2b2-4fe1-77d0-08d8e8d33249
• Build: 20250728.1
• Date Produced: July 28, 2025 7:56:32 PM UTC
• Commit: 8dca4f8ae100b102230287f8cc1b75264c9f1a6f
• Branch: refs/heads/release/8.0

• Updates:
  • From 8.0.0-beta.25366.2 to 8.0.0-beta.25378.1
    • Microsoft.DotNet.Arcade.Sdk
    • Microsoft.DotNet.Helix.Sdk

[ellahathaway]

@mmitche - this arcade flow is breaking one of the tests. The flow includes a change you made: dotnet/arcade@8dca4f8. Can you please TAL? Thanks.

[xUnit.net 00:38:43.73]     Microsoft.DotNet.InstallationScript.Tests.GivenThatIWantToInstallDotnetFromAScript.WhenInstallingASpecificVersionOfAspNetCoreRuntime(version: "9.0.0", effectiveVersion: null) [FAIL]
  Failed Microsoft.DotNet.InstallationScript.Tests.GivenThatIWantToInstallDotnetFromAScript.WhenInstallingASpecificVersionOfAspNetCoreRuntime(version: "9.0.0", effectiveVersion: null) [6 s]
  Error Message:
   System.UnauthorizedAccessException : Access to the path 'dotnet.exe' is denied.
  Stack Trace:
     at System.IO.FileSystem.RemoveDirectoryRecursive(String fullPath, WIN32_FIND_DATA& findData, Boolean topLevel)
   at System.IO.FileSystem.RemoveDirectory(String fullPath, Boolean recursive)
   at Microsoft.DotNet.InstallationScript.Tests.GivenThatIWantToInstallDotnetFromAScript.Dispose() in D:\a\_work\1\s\tests\Install-Scripts.Test\GivenThatIWantToInstallDotnetFromAScript.cs:line 202
   at ReflectionAbstractionExtensions.DisposeTestClass(ITest test, Object testClass, IMessageBus messageBus, ExecutionTimer timer, CancellationTokenSource cancellationTokenSource) in /_/src/xunit.execution/Extensions/ReflectionAbstractionExtensions.cs:line 79