Bump codecov/codecov-action from 5.5.2 to 6.0.0 in the actions group #9144

Job	Run time
Docs Checks	44s
CPython 3.13t-ubuntu-latest	11m 36s
static	3m 9s
Make an sdist	18s
CPython 3.10-ubuntu-latest	11m 39s
Coverage	12m 25s
CPython pypy-3.11-ubuntu-latest	12m 38s
Typing Tests (3.10)	1m 3s
Link Check	3m 36s
Typing Tests (3.11)	59s
DocTest	1m 2s
Integration Tests	59s
Test minimum dependencies and Python	1m 2s
Install from SDist and Test	1m 12s
	1h 2m 22s

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