Decrease memory usage in ARMv7 CI #1101

Job	Run time
clippy-rustfmt	1m 2s
build (aarch64-unknown-linux-gnu, ubuntu-latest, true)	7m 2s
build (aarch64-unknown-linux-musl, ubuntu-latest, true)	7m 29s
build (armv7-unknown-linux-gnueabihf, ubuntu-latest, true)	6m 48s
build (armv7-unknown-linux-musleabihf, ubuntu-latest, true)	7m 6s
build (x86_64-apple-darwin, macos-latest)	3m 59s
build (x86_64-pc-windows-gnu, windows-latest, true, .exe)	6m 30s
build (x86_64-pc-windows-msvc, windows-latest, .exe)	4m 58s
build (aarch64-pc-windows-msvc, windows-latest, .exe, true)	3m 50s
build (x86_64-unknown-linux-gnu, ubuntu-latest)	2m 57s
build (x86_64-unknown-linux-musl, ubuntu-latest)	3m 14s
github-release	0s
	54m 55s

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