Perf improvement: caching, json_middleware

[pr-benchmarks]

Scenario	Environment	Date	Old RPS	New RPS	Change	Deviation	StDev	Dependencies
caching [Fixed]	Caching Platform 2- Trends Database Intel Windows	05/08/2025 22:01:31	435,862	447,999	2.78 % (12,137) 👍	3.97 σ	3,055.03	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...1bb3fe6 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
json_middleware [Fixed]	Json 10k 3- Trends Arm 28 Linux	05/08/2025 22:51:12	447,677	450,595	0.65 % (2,918) 👍	2.53 σ	1,151.79	Changes Name Version Diff Json.dll 1.0.0 -> 1.0.0 aspnet/Benchmarks@ef48e1d...ed6ac8c

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