Perf regression: antiforgery-generation, json_middleware

[pr-benchmarks]

Scenario	Environment	Date	Old RPS	New RPS	Change	Deviation	StDev	Dependencies
antiforgery-generation [Fixed]	Antiforgery Token Generation 5- Trends Intel Win	08/20/2025 18:53:44	374,978	361,385	-3.62 % (-13,593) 👎	-4.23 σ	3,216.89	Changes Name Version Diff Microsoft.AspNetCore.Antiforgery.dll 10.0.0-rc.2.25416.109 -> 10.0.0-rc.2.25419.109 dotnet/dotnet@7f2a07b...ebcfe0b Microsoft.AspNetCore.App 10.0.0-rc.2.25416.109 -> 10.0.0-rc.2.25419.109 7f2a07b...ebcfe0b Microsoft.NETCore.App 10.0.0-rc.2.25416.109 -> 10.0.0-rc.2.25419.109 dotnet/runtime@7f2a07b...ebcfe0b
json_middleware	Json 5M 9- Trends Cobalt Cloud Lin Server	08/20/2025 03:04:56	345	342	-0.63 % (-2) 👎	-4.99 σ	0.44	Changes Name Version Diff Microsoft.AspNetCore.Antiforgery.dll 10.0.0-rc.2.25416.105 -> 10.0.0-rc.2.25419.103 dotnet/dotnet@a01724d...46943c6 Microsoft.AspNetCore.App 10.0.0-rc.2.25416.105 -> 10.0.0-rc.2.25419.103 a01724d...46943c6 Microsoft.NETCore.App 10.0.0-rc.2.25416.105 -> 10.0.0-rc.2.25419.103 dotnet/runtime@a01724d...46943c6

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