perf: use serde_json_borrow for Synth output #23807

Job	Run time
Draft Release	0s
Check Examples	1m 36s
Check if Build	3s
Test AWS Lambda Build	1m 4s
Run Tests (Cloudflare)	3m 23s
Run Tests (WASM)	1m 25s
Outputs matrix used for cross compilation / setup-matrix	23s
Run Tests on linux-x64-gnu	4m 26s
Run Tests on linux-x64-musl	7m 44s
Run Tests on linux-arm64-gnu	14m 1s
Run Tests on linux-arm64-musl	12m 10s
Run Tests on linux-ia32-gnu	6m 43s
Run Tests on darwin-arm64	5m 44s
Run Tests on darwin-x64	6m 9s
Run Tests on win32-x64-msvc	12m 23s
Run Tests on win32-arm64-msvc	5m 33s
Run Tests on win32-ia32-msvc	16m 50s
Release	0s
Release (AWS Lambda)	0s
Publish NPM main package	0s
Semantic Release	0s
build-and-push-image	0s
Homebrew Release	0s
	1h 39m 37s

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