build(deps): bump actions/checkout from 6 to 7 #1360

Job	Run time
x86 (x86_64-unknown-linux-gnu, 1.85.0)	27s
cross (aarch64-unknown-linux-gnu, stable)	48s
cross (aarch64-unknown-linux-gnu, 1.85.0)	44s
cross (powerpc-unknown-linux-gnu, stable)	54s
build (1.85.0, wasm32-unknown-unknown)	16s
test-derive (stable)	24s
test-derive (1.85.0)	29s
x86 (x86_64-unknown-linux-gnu, stable)	16s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.85.0)	15s
test (x86_64-apple-darwin, macos-latest, 1.85.0)	26s
build (1.85.0, thumbv7em-none-eabi)	18s
build (stable, thumbv7em-none-eabi)	10s
test (x86_64-pc-windows-msvc, windows-latest, stable)	45s
test (i686-unknown-linux-gnu, ubuntu-latest, 1.85.0, sudo apt update && sudo apt install gcc-mult...	30s
test (i686-unknown-linux-gnu, ubuntu-latest, stable, sudo apt update && sudo apt install gcc-mult...	32s
cross (powerpc-unknown-linux-gnu, 1.85.0)	48s
build (stable, armv7a-none-eabi)	9s
test (x86_64-pc-windows-msvc, windows-latest, 1.85.0)	33s
build (stable, wasm32-unknown-unknown)	10s
test (x86_64-unknown-linux-gnu, ubuntu-latest, stable)	7s
test (x86_64-apple-darwin, macos-latest, stable)	23s
build (1.85.0, armv7a-none-eabi)	18s
minimal-versions / minimal-versions	21s
	10m 3s

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