Do not enable json by default #2713

Job	Run time
build_versions (stable)	2m 51s
Test	44s
Test	54s
build_versions (beta)	2m 56s
Test (charset)	44s
build_versions (1.71.1)	2m 42s
Test (charset)	53s
Test (cookies)	54s
Test (cookies)	1m 6s
Test (socks-proxy)	43s
Test (socks-proxy)	1m 4s
Test (gzip)	56s
cargo-deny (aarch64-apple-ios)	21s
Test (gzip)	54s
Test (brotli)	1m 14s
Test (brotli)	45s
cargo-deny (aarch64-linux-android)	19s
Test (json)	57s
cargo-deny (i686-pc-windows-gnu)	22s
Test (json)	45s
Test (native-tls)	58s
cargo-deny (i686-pc-windows-msvc)	18s
Test (native-tls)	1m 9s
cargo-deny (i686-unknown-linux-gnu)	19s
Test (rustls-no-provider)	1m 6s
cargo-deny (wasm32-unknown-unknown)	18s
Docs	1m 52s
cargo-deny (x86_64-apple-darwin)	20s
Lint	34s
cargo-deny (x86_64-apple-ios)	20s
cargo-deny (x86_64-pc-windows-gnu)	18s
cargo-deny (x86_64-pc-windows-msvc)	20s
cargo-deny (x86_64-unknown-linux-gnu)	21s
cargo-deny (x86_64-unknown-redox)	18s
	30m 35s

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