chore(deps): update actions/cache action to v6.1.0 (#1468) #3414

Job	Run time
test_min_deps (windows-latest)	3m 1s
Integration Tests (pdm.lock)	33s
test_min_deps (macos-latest)	40s
Integration Tests (pdm.minimal.lock)	27s
test_min_deps (ubuntu-latest)	34s
test (3.14, macos-latest)	51s
test (3.11, windows-latest)	1m 26s
test (3.13, ubuntu-latest)	49s
test (3.11, ubuntu-latest)	53s
test (3.12, windows-latest)	1m 28s
test (3.14, ubuntu-latest)	44s
test (3.12, macos-latest)	57s
test (3.13, macos-latest)	43s
test (3.13, windows-latest)	1m 17s
test (3.12, ubuntu-latest)	58s
test (3.14, windows-latest)	1m 14s
test (3.11, macos-latest)	35s
Combine & check coverage	18s
	17m 28s

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