Move all connectors to unversioned #2458

Job	Run time
build_versions (stable)	13s
Test	43s
build_versions (beta)	40s
Test	38s
Test (charset)	48s
build_versions (1.71.1)	37s
cargo-deny (aarch64-apple-ios)	21s
Test (charset)	38s
Test (cookies)	45s
cargo-deny (aarch64-linux-android)	31s
Test (cookies)	35s
Docs	1m 30s
cargo-deny (i686-pc-windows-gnu)	20s
Test (socks-proxy)	50s
Test (socks-proxy)	30s
cargo-deny (i686-pc-windows-msvc)	20s
Test (gzip)	43s
Test (gzip)	42s
cargo-deny (i686-unknown-linux-gnu)	22s
Test (brotli)	42s
Lint	18s
Test (brotli)	43s
Test (json)	43s
cargo-deny (wasm32-unknown-unknown)	21s
Test (json)	35s
Test (native-tls)	51s
cargo-deny (x86_64-apple-darwin)	20s
Test (native-tls)	43s
cargo-deny (x86_64-apple-ios)	21s
cargo-deny (x86_64-pc-windows-gnu)	22s
cargo-deny (x86_64-pc-windows-msvc)	20s
cargo-deny (x86_64-unknown-linux-gnu)	21s
cargo-deny (x86_64-unknown-redox)	19s
	18m 45s

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