Don't keep subcommand stdout around #2291

Job	Run time
Clippy	44s
Rustfmt	11s
Code coverage	2m 52s
Integration tests (macos-latest)	2m 26s
Integration tests (ubuntu-latest)	2m 13s
Unit tests (macos-latest, aarch64-apple-darwin, false)	2m 29s
Unit tests (macos-13, x86_64-apple-darwin, false)	4m 13s
Unit tests (windows-latest, x86_64-pc-windows-msvc, false)	5m 17s
Unit tests (ubuntu-latest, x86_64-unknown-linux-gnu, false)	2m 23s
Unit tests (ubuntu-latest, x86_64-unknown-linux-musl, true)	2m 51s
Unit tests (ubuntu-latest, i686-unknown-linux-gnu, true)	2m 47s
Unit tests (ubuntu-latest, arm-unknown-linux-gnueabihf, true)	3m 26s
Unit tests (ubuntu-latest, aarch64-unknown-linux-gnu, true)	3m 11s
	35m 3s

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