Perf improvement: json

[pr-benchmarks]

Scenario	Environment	Date	Old RPS	New RPS	Change	Deviation	StDev	Dependencies
json	Json Crossgen2 6- Trends Gold Win	11/21/2025 01:23:35	1,319,522	1,394,774	5.70 % (75,252) 👍	2.71 σ	27,769.52	Changes Name Version Diff Benchmarks.dll 1.0.0 -> 1.0.0 aspnet/Benchmarks@6a9f44e...a464ca7

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