Tests

downgrade codecov to v3 #777

Job	Run time
static-tests (3.9)	31s
cpython (3.7)	30s
cpython (3.8)	25s
cpython (3.9)	30s
cpython (3.10)	31s
pypy (pypy-3.7)	54s
cpython (3.11)	25s
cpython-lxml (3.7)	37s
cpython (3.12)	44s
pypy (pypy-3.8)	32s
cpython-lxml (3.8)	36s
pypy (pypy-3.9)	34s
cpython-lxml (3.9)	40s
pypy (pypy-3.10)	36s
cpython-lxml (3.10)	39s
cpython-lxml (3.11)	34s
cpython-lxml (3.12)	59s
Build and publish to PyPI and TestPyPI	41s
	10m 58s

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