chore(deps): update actions/checkout action to v6.0.2 #3226

Job	Run time
test_min_deps (macos-latest)	1m 2s
Integration Tests (pdm.lock)	28s
test_min_deps (ubuntu-latest)	44s
test_min_deps (windows-latest)	1m 14s
Integration Tests (pdm.minimal.lock)	29s
test (3.13, ubuntu-latest)	1m 10s
test (3.11, macos-latest)	1m 3s
test (3.11, windows-latest)	1m 33s
test (3.12, ubuntu-latest)	1m 6s
test (3.10, ubuntu-latest)	1m 11s
test (3.11, ubuntu-latest)	57s
test (3.10, macos-latest)	1m 26s
test (3.13, macos-latest)	43s
test (3.12, macos-latest)	59s
test (3.13, windows-latest)	1m 42s
test (3.14, macos-latest)	1m 8s
test (3.14, ubuntu-latest)	1m 4s
test (3.14, windows-latest)	1m 39s
test (3.12, windows-latest)	1m 40s
test (3.10, windows-latest)	1m 34s
Combine & check coverage	13s
	23m 5s

Provide feedback