Bump codecov/codecov-action from 3 to 4 #184

Job	Run time
Python 3.12 Tests	39s
Python 3.11 Tests	33s
Python 3.10 Tests	33s
Python 3.9, with Code Coverage	31s
Python 3.9, Windows	1m 6s
Python 3.9, MacOS	40s
Twine	35s
Document Checks	30s
Code Style Checks	48s
ASDF Standard Document Build	49s
ASDF Document Build	54s
ASDF-transform-schemas Document Build	58s
ASDF-coordinates-schemas Document Build	41s
ASDF-wcs-schemas Document Build	47s
ASDF-astropy Document Build	47s
rad Document Build	46s
roman_datamodels Document Build	46s
stdatamodels Document Build	1m 20s
	13m 43s

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