Bump codecov/codecov-action from 5.3.1 to 5.4.0 #660

Job	Run time
mypy	3m 40s
py3.13 \| macos \| integration tests	18m 20s
py3.13 \| macos \| unit tests	8m 32s
py3.13 \| ubuntu \| integration tests	17m 10s
py3.13 \| ubuntu \| unit tests	13m 40s
py3.13 \| windows \| integration tests	31m 9s
py3.13 \| windows \| unit tests	20m 38s
py3.10 \| ubuntu \| integration tests	17m 9s
py3.10 \| ubuntu \| unit tests	13m 41s
py3.11 \| ubuntu \| unit tests	13m 12s
py3.12 \| ubuntu \| unit tests	14m 11s
merge-test-artifacts	2s
	2h 51m 24s

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