Add Codecov step to CI (#674) #2383

Job	Run time
Run tests (3.11.0)	24s
Run tests (3.9)	32s
Run tests (3.10)	23s
Run tests (3.13)	16s
Run tests (3.13.0)	24s
Run tests (3.11)	23s
Run tests (3.9.12)	21s
Run tests (3.10.4)	19s
Run tests (3.12)	16s
Run tests (3.12.0)	20s
Run tests (3.14)	25s
Run tests (pypy3.10)	25s
Run tests (pypy3.9)	27s
Run tests (pypy3.11)	29s
Create an issue if daily tests failed	0s
	5m 24s

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