Bump codecov/codecov-action from 3 to 4 #666

Job	Run time
test (1.0, ubuntu-latest, x64)	4m 6s
test (1.0, windows-latest, x64)	9m 40s
test (1.0, macOS-latest, x64)	5m 55s
test (1.6, ubuntu-latest, x64)	4m 5s
test (1.6, windows-latest, x64)	13m 45s
test (1.6, macOS-latest, x64)	4m 33s
test (1, ubuntu-latest, x64)	3m 32s
test (1, windows-latest, x64)	4m 45s
test (1, macOS-latest, x64)	6m 28s
test (~1.10.0-0, ubuntu-latest, x64)	3m 39s
test (~1.10.0-0, windows-latest, x64)	5m 35s
test (~1.10.0-0, macOS-latest, x64)	4m 15s
test (nightly, ubuntu-latest, x64)	4m 25s
test (nightly, windows-latest, x64)	5m 27s
test (nightly, macOS-latest, x64)	7m 9s
test (ubuntu-latest, 1, x86)	4m 37s
	1h 31m 56s

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