Do not enable json by default #2712

Job	Run time
build_versions (stable)	2m 34s
Test	51s
build_versions (beta)	2m 49s
Test	59s
Test (charset)	56s
cargo-deny (aarch64-apple-ios)	19s
build_versions (1.71.1)	2m 44s
Test (charset)	1m 1s
Test (cookies)	1m 6s
cargo-deny (aarch64-linux-android)	22s
Test (cookies)	1m 7s
Test (socks-proxy)	54s
cargo-deny (i686-pc-windows-gnu)	20s
Test (socks-proxy)	44s
Docs	1m 43s
Test (gzip)	52s
cargo-deny (i686-pc-windows-msvc)	23s
Test (gzip)	53s
Test (brotli)	1m 16s
cargo-deny (i686-unknown-linux-gnu)	23s
Test (brotli)	44s
Test (json)	1m 4s
cargo-deny (wasm32-unknown-unknown)	18s
Lint	29s
Test (json)	57s
Test (native-tls)	1m 1s
cargo-deny (x86_64-apple-darwin)	20s
Test (native-tls)	1m 8s
cargo-deny (x86_64-apple-ios)	18s
Test (rustls-no-provider)	1m 13s
cargo-deny (x86_64-pc-windows-gnu)	18s
cargo-deny (x86_64-pc-windows-msvc)	18s
cargo-deny (x86_64-unknown-linux-gnu)	23s
cargo-deny (x86_64-unknown-redox)	18s
	31m 5s

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