[main] Source code updates from dotnet/aspnetcore

[dotnet-maestro]

Note

This is a codeflow update. It may contain both source code changes from
the source repo
as well as dependency updates. Learn more here.

This pull request brings the following source code changes

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

• Subscription: b220167f-d2e6-45e1-aeb6-ced11265d408
• Build: 20260519.14 (315062)
• Date Produced: May 19, 2026 10:06:47 PM UTC
• Commit: c0c2230799a3f876aa673a66bc008bf9b803acac
• Commit Diff: b24ff65...c0c2230
• Branch: main

Diff the source with this PR branch

darc vmr diff --name-only https://github.com/dotnet/aspnetcore:c0c2230799a3f876aa673a66bc008bf9b803acac..https://github.com/dotnet/dotnet:darc-main-cebb0e81-4893-4fae-81ce-daee1a355ad9

[dotnet-maestro]

Note

PRs from original repository included in this codeflow update:

• (follow-up) fix KeyRingProvider thread pool starvation on cold start aspnetcore#66743
• RenderFragment serialization aspnetcore#66528
• [main] Source code updates from dotnet/dotnet aspnetcore#66741
• SupplyParameterFromSession support for Blazor aspnetcore#65184

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