chore(deps): update actions/checkout action to v5 #2958

Job	Run time
test_min_deps (ubuntu-latest)	41s
Integration Tests (pdm.minimal.lock)	33s
test_min_deps (windows-latest)	1m 6s
test_min_deps (macos-latest)	1m 2s
Integration Tests (pdm.lock)	34s
test (3.9, macos-latest)	1m 5s
test (3.9, ubuntu-latest)	1m 22s
test (3.9, windows-latest)	1m 49s
test (3.10, macos-latest)	1m 17s
test (3.11, windows-latest)	1m 42s
test (3.12, ubuntu-latest)	1m 29s
test (3.11, ubuntu-latest)	1m 15s
test (3.10, windows-latest)	1m 58s
test (3.12, macos-latest)	53s
test (3.11, macos-latest)	1m 0s
test (3.12, windows-latest)	1m 55s
test (3.13, windows-latest)	2m 4s
test (3.13, ubuntu-latest)	1m 29s
test (3.13, macos-latest)	47s
test (3.10, ubuntu-latest)	1m 27s
Combine & check coverage	14s
	25m 42s

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