sha1

CI: replace MIPS cross tests with PPC32 #831

Job	Run time
test-msrv	3m 7s
cross (1.51.0, aarch64-unknown-linux-gnu, default)	4m 12s
cross (1.51.0, powerpc-unknown-linux-gnu, default)	3m 35s
cross (stable, aarch64-unknown-linux-gnu, default)	1m 12s
cross (stable, powerpc-unknown-linux-gnu, default)	55s
minimal-versions / minimal-versions	1m 39s
set-msrv / set-msrv	2s
windows (x86_64-pc-windows-gnu, stable)	1m 31s
linux (x86_64-unknown-linux-gnu, 1.57.0)	4m 24s
build (1.57.0, thumbv7em-none-eabi)	3m 7s
linux (x86_64-unknown-linux-gnu, stable)	1m 48s
build (1.57.0, wasm32-unknown-unknown)	3m 6s
macos (1.57.0)	4m 16s
build (stable, thumbv7em-none-eabi)	25s
build (stable, wasm32-unknown-unknown)	30s
macos (stable)	50s
	34m 39s

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