Reuse the Client in all cases #598

Job	Run time
format	9s
cargo-build (aarch64-linux-android, ubuntu-22.04)	2m 56s
cargo-build (armv7-linux-androideabi, ubuntu-22.04)	2m 53s
cargo-test (ubuntu-22.04, default, stable)	3m 6s
Clippy	49s
cargo-build (i686-linux-android, ubuntu-22.04)	2m 56s
cargo-test (macos-12, default, stable)	5m 54s
cargo-build (x86_64-linux-android, ubuntu-22.04)	2m 57s
cargo-test (windows-2019, default, stable)	8m 7s
cargo-test (ubuntu-22.04, beta)	3m 16s
cargo-build (x86_64-unknown-linux-musl, ubuntu-22.04)	2m 32s
cargo-test (ubuntu-22.04, blocking)	3m 43s
cargo-build (aarch64-apple-ios, macos-12)	2m 55s
cargo-test (ubuntu-22.04, blocking,beta)	4m 14s
cargo-test (ubuntu-22.04, tls-rustls --no-default-features)	3m 9s
cargo-test (ubuntu-22.04, tls-vendored-openssl --no-default-features)	4m 16s
cargo-test (ubuntu-22.04, beta, default)	2m 45s
cargo-test (ubuntu-22.04, 1.75.0, default)	3m 25s
	1h 0m 2s

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