Bump codecov/codecov-action from 4 to 5 #78

Job	Run time
doctests	1m 2s
test (ubuntu-latest, x64, 1.6)	1m 29s
test (ubuntu-latest, x64, nightly)	1m 35s
test (ubuntu-latest, x86, 1.6)	1m 27s
test (ubuntu-latest, x86, nightly)	1m 33s
test (macOS-latest, x64, 1.6)	8s
test (macOS-latest, x64, nightly)	1m 37s
test (windows-latest, x64, 1.6)	12m 3s
test (windows-latest, x64, nightly)	1m 56s
test (windows-latest, x86, 1.6)	11m 41s
test (windows-latest, x86, nightly)	2m 1s
	36m 32s

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