Bump codecov/codecov-action from 3 to 4 #289

Job	Run time
Test on macOS-latest, Python 3.8	1s
Test on macOS-latest, Python 3.8	2m 41s
Test on macOS-latest, Python 3.9	1s
Test on macOS-latest, Python 3.9	2m 7s
Test on macOS-latest, Python 3.10	1s
Test on macOS-latest, Python 3.10	2m 27s
Test on macOS-latest, Python 3.11	1s
Test on macOS-latest, Python 3.11	1m 48s
Test on ubuntu-latest, Python 3.8	1m 1s
Test on ubuntu-latest, Python 3.8	56s
Test on ubuntu-latest, Python 3.9	56s
Test on ubuntu-latest, Python 3.9	57s
Test on ubuntu-latest, Python 3.10	58s
Test on ubuntu-latest, Python 3.10	56s
Test on ubuntu-latest, Python 3.11	54s
Test on ubuntu-latest, Python 3.11	57s
Test on windows-latest, Python 3.8	2m 52s
Test on windows-latest, Python 3.8	7m 49s
Test on windows-latest, Python 3.9	2m 46s
Test on windows-latest, Python 3.9	2m 56s
Test on windows-latest, Python 3.10	2m 47s
Test on windows-latest, Python 3.10	3m 23s
Test on windows-latest, Python 3.11	3m 43s
Test on windows-latest, Python 3.11	3m 22s
	46m 20s

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