chore(deps): update actions/setup-python action to v7 #3402

Job	Run time
test_min_deps (macos-latest)	38s
test_min_deps (ubuntu-latest)	39s
Integration Tests (pdm.minimal.lock)	50s
Integration Tests (pdm.lock)	44s
test (3.11, windows-latest)	1m 23s
test (3.13, macos-latest)	33s
test (3.13, windows-latest)	1m 27s
test (3.14, ubuntu-latest)	48s
test (3.11, ubuntu-latest)	50s
test (3.12, ubuntu-latest)	53s
test (3.14, windows-latest)	1m 14s
test (3.12, macos-latest)	45s
test (3.12, windows-latest)	1m 3s
test_min_deps (windows-latest)	1m 14s
test (3.11, macos-latest)	49s
test (3.13, ubuntu-latest)	57s
test (3.14, macos-latest)	1m 2s
Combine & check coverage	14s
	16m 3s

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