ci: bump actions/checkout from 5 to 6 (#1247) #929

Job	Run time
build (1.85.0, wasm32-unknown-unknown)	14s
build (stable, wasm32-unknown-unknown)	17s
build (stable, armv7a-none-eabi)	12s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.85.0)	17s
build (1.85.0, thumbv7em-none-eabi)	15s
test (i686-unknown-linux-gnu, ubuntu-latest, stable, sudo apt update && sudo apt install gcc-mult...	40s
build (stable, thumbv7em-none-eabi)	12s
test (x86_64-apple-darwin, macos-latest, 1.85.0)	25s
build (1.85.0, armv7a-none-eabi)	16s
test (x86_64-unknown-linux-gnu, ubuntu-latest, stable)	29s
cross (aarch64-unknown-linux-gnu, stable)	47s
test (i686-unknown-linux-gnu, ubuntu-latest, 1.85.0, sudo apt update && sudo apt install gcc-mult...	37s
cross (aarch64-unknown-linux-gnu, 1.85.0)	45s
cross (powerpc-unknown-linux-gnu, stable)	53s
test (x86_64-apple-darwin, macos-latest, stable)	26s
test (x86_64-pc-windows-msvc, windows-latest, 1.85.0)	32s
test (x86_64-pc-windows-msvc, windows-latest, stable)	50s
x86 (x86_64-unknown-linux-gnu, 1.85.0)	24s
x86 (x86_64-unknown-linux-gnu, stable)	14s
cross (powerpc-unknown-linux-gnu, 1.85.0)	45s
minimal-versions / minimal-versions	1m 2s
	10m 32s

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