ci: bump actions/checkout from 4.1.4 to 4.1.5 #525

Job	Run time
Linux/ARM - Release tests (i686-unknown-linux-gnu)	1m 53s
test (stable, ubuntu-latest)	4m 4s
Linux/ARM - Release tests (armv7-unknown-linux-gnueabihf)	2m 26s
Build and check benchmarks	1m 8s
test (stable, macos-latest)	4m 10s
Linux/ARM - Release tests (powerpc64-unknown-linux-gnu)	2m 22s
Build documentation	15s
test (stable, windows-latest)	7m 40s
test (beta, ubuntu-latest)	4m 12s
no_std build (stable)	1m 11s
Tests w. sanitizers	1m 21s
no_std build (nightly)	1m 33s
WebAssembly - Release build (wasm32-unknown-unknown)	19s
test (beta, macos-latest)	3m 48s
test (beta, windows-latest)	7m 30s
test (nightly, ubuntu-latest)	4m 4s
test (nightly, macos-latest)	3m 44s
test (nightly, windows-latest)	7m 49s
test (1.74.0, ubuntu-latest)	4m 19s
test (1.74.0, macos-latest)	3m 26s
test (1.74.0, windows-latest)	7m 33s
	1h 14m 47s

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