chore(deps): update actions/setup-python action to v6 (#1315) #3007

Job	Run time
test_min_deps (macos-latest)	49s
Integration Tests (pdm.minimal.lock)	26s
test_min_deps (ubuntu-latest)	45s
test_min_deps (windows-latest)	1m 5s
Integration Tests (pdm.lock)	36s
test (3.9, windows-latest)	1m 48s
test (3.9, ubuntu-latest)	1m 24s
test (3.9, macos-latest)	2m 1s
test (3.10, windows-latest)	1m 47s
test (3.12, macos-latest)	56s
test (3.10, macos-latest)	1m 8s
test (3.11, windows-latest)	2m 6s
test (3.10, ubuntu-latest)	1m 15s
test (3.11, ubuntu-latest)	1m 23s
test (3.13, ubuntu-latest)	1m 32s
test (3.12, ubuntu-latest)	1m 25s
test (3.11, macos-latest)	59s
test (3.13, macos-latest)	1m 13s
test (3.13, windows-latest)	1m 40s
test (3.12, windows-latest)	1m 37s
Combine & check coverage	13s
	26m 8s

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