tests

Let codecov-action autodetect the coverage report #122

Job	Run time
test (3.8, ubuntu-latest)	3m 46s
test_cygwin (39, windows-latest)	14m 40s
test (3.8, windows-latest)	4m 4s
collateral (diffcov)	4m 50s
collateral (docs)	2m 6s
test (3.12, ubuntu-latest)	4m 14s
test (3.12, macos-latest)	3m 57s
collateral (check-extern)	10s
test (3.12, windows-latest)	4m 3s
test (3.9, ubuntu-latest)	3m 59s
test (3.10, ubuntu-latest)	4m 4s
test (3.11, ubuntu-latest)	4m 3s
test (pypy3.10, ubuntu-latest, stdlib)	4m 14s
test (ubuntu-latest, 3.10, stdlib)	3m 48s
test (3.8, macos-13)	4m 16s
integration-test	0s
check	1s
release	0s
	1h 6m 15s

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