Fix excessive stack sizes #2718

Job	Run time
Lint	18s
Docs	21s
Test	6s
build_versions (stable)	13s
Test (charset)	13s
Test	1s
build_versions (beta)	17s
Test (cookies)	9s
Test (charset)	1s
build_versions (1.71.1)	20s
Test (socks-proxy)	3s
Test (cookies)	1s
Test (gzip)	8s
Test (socks-proxy)	1s
Test (brotli)	12s
Test (gzip)	1s
cargo-deny (aarch64-apple-ios)	1s
Test (json)	7s
Test (brotli)	1s
cargo-deny (aarch64-linux-android)	1s
Test (native-tls)	4s
Test (json)	1s
cargo-deny (i686-pc-windows-gnu)	1s
Test (native-tls)	1s
cargo-deny (i686-pc-windows-msvc)	1s
Test (rustls-no-provider)	1s
cargo-deny (i686-unknown-linux-gnu)	1s
cargo-deny (wasm32-unknown-unknown)	1s
cargo-deny (x86_64-apple-darwin)	1s
cargo-deny (x86_64-apple-ios)	1s
cargo-deny (x86_64-pc-windows-gnu)	1s
cargo-deny (x86_64-pc-windows-msvc)	1s
cargo-deny (x86_64-unknown-linux-gnu)	1s
cargo-deny (x86_64-unknown-redox)	1s
	2m 52s

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