Perf improvement: json

[pr-benchmarks]

Scenario	Environment	Date	Old RPS	New RPS	Change	Deviation	StDev	Dependencies
json [Fixed]	Json Platform 3- Trends Arm 28 Linux	05/07/2025 22:18:19	962,391	1,071,836	11.37 % (109,445) 👍	2.22 σ	49,378.55	Changes Name Version Diff Microsoft.AspNetCore.Antiforgery.dll 10.0.0-preview.5.25230.108 -> 10.0.0-preview.5.25256.101 dotnet/dotnet@35ccf19...025e4e5 PlatformBenchmarks.dll 1.0.0 -> 1.0.0 aspnet/Benchmarks@ef48e1d...66a16cd Microsoft.AspNetCore.App 10.0.0-preview.5.25230.108 -> 10.0.0-preview.5.25256.101 35ccf19...025e4e5 Microsoft.NETCore.App 10.0.0-preview.5.25230.108 -> 10.0.0-preview.5.25256.101 dotnet/runtime@35ccf19...025e4e5

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@sebastienros