Perf regression: antiforgery-generation, json_middleware

[pr-benchmarks]

Scenario	Environment	Date	Old RPS	New RPS	Change	Deviation	StDev	Dependencies
antiforgery-generation	Antiforgery Token Generation 6- Trends Amd Lin2	07/31/2025 02:09:34	287,812	280,469	-2.55 % (-7,343) 👎	-3.88 σ	1,891.35	Changes Name Version Diff Antiforgery.dll 1.0.0 -> 1.0.0 aspnet/Benchmarks@4f899da...a05388c
json_middleware	Json 5M 2- Trends Cobalt Cloud Linux	07/30/2025 09:42:21	345	344	-0.54 % (-2) 👎	-3.36 σ	0.55	Changes Name Version Diff Microsoft.CSharp.dll 10.0.0-preview.7.25376.102 -> 10.0.0-preview.7.25377.103 dotnet/dotnet@03fb785...6a953e7 Microsoft.AspNetCore.Antiforgery.dll 10.0.0-rc.1.25376.102 -> 10.0.0-rc.1.25377.103 dotnet/dotnet@03fb785...6a953e7 Microsoft.AspNetCore.App 10.0.0-rc.1.25376.102 -> 10.0.0-rc.1.25377.103 03fb785...6a953e7 Microsoft.NETCore.App 10.0.0-preview.7.25376.102 -> 10.0.0-preview.7.25377.103 dotnet/runtime@03fb785...6a953e7

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