chore: disable default std serde_json feature

[mattsse]

towards #13041

#[cfg(not(any(feature = "std", feature = "alloc")))]
compile_error! {
    "serde_json requires that either `std` (default) or `alloc` feature is enabled"
}

serde-json supports no-std but requires at least alloc

[codspeed-hq]

CodSpeed Performance Report

Merging #13513 will not alter performance

_{Comparing fix/disable-default-std-for-serde-json (4e4a708) with main (6e14010)}

Summary

✅ 73 untouched benchmarks
🆕 4 new benchmarks
⁉️ 4 dropped benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	main	fix/disable-default-std-for-serde-json	Change
⁉️	range lookup`	611 µs	N/A	N/A
⁉️	any lookup`	19.8 ms	N/A	N/A
⁉️	`prefix set	preload size: 1000	input size: 1000	Vec with binary search lookup`
⁉️	`prefix set	preload size: 1000	input size: 1000	Vec with custom cursor lookup`
🆕	range lookup`	N/A	608.3 µs	N/A
🆕	any lookup`	N/A	19.3 ms	N/A
🆕	`prefix set	preload size: 1000	input size: 999	Vec with binary search lookup`
🆕	`prefix set	preload size: 1000	input size: 999	Vec with custom cursor lookup`