Tests

Bump codecov/codecov-action from 5.0.2 to 5.0.3 #4710

Job	Run time
OS/Python/stable matrix pre-compute	1s
tests (ubuntu-24.04, 3.14-dev, unstable)	7m 10s
tests (ubuntu-24.04, 3.13, stable)	26m 23s
tests (ubuntu-24.04, 3.10, stable)	26m 11s
tests (macos-15, 3.14-dev, unstable)	2m 21s
tests (macos-15, 3.13, stable)	1m 19s
tests (macos-15, 3.10, stable)	1m 33s
tests (windows-2022, 3.14-dev, unstable)	25m 21s
tests (windows-2022, 3.13, stable)	1h 14m 1s
tests (windows-2022, 3.10, stable)	59m 10s
	3h 43m 30s

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