Store license-files in licenses subfolder #5929

Job	Run time
collateral (diffcov)	5m 45s
collateral (docs)	1m 57s
test_cygwin (39, windows-latest)	17m 54s
test (3.9, ubuntu-latest)	4m 27s
test (3.9, macos-latest)	3m 45s
test (3.9, windows-latest)	11m 35s
test (3.13, ubuntu-latest)	5m 27s
test (3.13, macos-latest)	3m 44s
test (3.13, windows-latest)	13m 38s
test (3.10, ubuntu-latest)	4m 21s
test (3.11, ubuntu-latest)	3m 54s
test (3.12, ubuntu-latest)	5m 35s
test (3.14, ubuntu-latest)	6m 52s
test (pypy3.10, ubuntu-latest, stdlib)	16m 3s
test (ubuntu-latest, 3.10, stdlib)	4m 20s
integration-test	0s
check	3s
release	0s
	1h 49m 20s

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