[main] Update dependencies from dotnet/arcade, dotnet/arcade-services

[dotnet-maestro]

This pull request updates the following dependencies

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

• Subscription: e1494738-68cf-4cfe-3661-08d8e287a9c2
• Build: 20251009.1 (286336)
• Date Produced: October 9, 2025 12:35:11 PM UTC
• Commit: 488413fe104056170673a048a07906314e101e5d
• Branch: main

• Updates:
  • From 11.0.0-beta.25504.3 to 11.0.0-beta.25509.1
    • Microsoft.DotNet.Arcade.Sdk
    • Microsoft.DotNet.Helix.Sdk

• Updates to .NET SDKs in root:
  • Updates sdk.version to 10.0.100-rc.1.25420.111
  • Updates tools.dotnet to 10.0.100-rc.1.25420.111

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

• Subscription: 4aecaf13-3af0-4dee-bf73-08d8e287ac39
• Build: 20251010.2 (286514)
• Date Produced: October 10, 2025 12:10:55 PM UTC
• Commit: 0f1c878868ea3660b00a22bfe556debfd39b2785
• Branch: main

• Updates:
  • From 1.1.0-beta.25504.1 to 1.1.0-beta.25510.2
    • Microsoft.DotNet.DarcLib
    • Microsoft.DotNet.ProductConstructionService.Client

[akoeplinger]

src/Microsoft.DotNet.Helix/Sdk/Microsoft.DotNet.Helix.Sdk.csproj(0,0): error NU1109: (NETCORE_ENGINEERING_TELEMETRY=Restore) Detected package downgrade: System.Text.Json from 8.0.6 to centrally defined 8.0.5. Update the centrally managed package version to a higher version. 
 Microsoft.DotNet.Helix.Sdk -> Azure.Core 1.49.0 -> System.Text.Json (>= 8.0.6) 
 Microsoft.DotNet.Helix.Sdk -> System.Text.Json (>= 8.0.5)

This would need updating
https://github.com/dotnet/arcade/blob/darc-main-e5056da4-cf01-40d8-a5fd-ab04dca70149/eng/BuildTask.Packages.props#L11 but the comment there makes me think this needs some more thought :)

/cc @ViktorHofer @premun

[ViktorHofer]

These versions can (and should) be bumped to 9.0.0. MSBuild upgraded to those months ago: https://github.com/dotnet/msbuild/blob/main/src/MSBuild/app.config.