Bump codecov/codecov-action from 3 to 4 #352

Job	Run time
Mypy (static type checker)	31s
Documentation link check	35s
Linters	53s
Build documentation	29s
Packaging	23s
Py:3.8 - Tw:21.2 - ubuntu-latest	45s
Py:3.8 - Tw:22.1 - ubuntu-latest	49s
Py:3.8 - Tw:23.10 - ubuntu-latest	48s
Py:3.9 - Tw:21.2 - ubuntu-latest	45s
Py:3.9 - Tw:22.1 - ubuntu-latest	46s
Py:3.9 - Tw:23.10 - ubuntu-latest	45s
Py:3.10 - Tw:21.2 - ubuntu-latest	48s
Py:3.10 - Tw:22.1 - ubuntu-latest	44s
Py:3.10 - Tw:23.10 - ubuntu-latest	47s
Py:3.11 - Tw:21.2 - ubuntu-latest	45s
Py:3.11 - Tw:22.1 - ubuntu-latest	45s
Py:3.11 - Tw:23.10 - ubuntu-latest	46s
Py:3.12 - Tw:21.2 - ubuntu-latest	58s
Py:3.12 - Tw:22.1 - ubuntu-latest	58s
Py:3.12 - Tw:23.10 - ubuntu-latest	1m 1s
Py:pypy-3.8 - Tw:current - ubuntu-latest	22s
Py:pypy-3.9 - Tw:current - ubuntu-latest	48s
-postgresPy:3.12 - Tw:23.10 - ubuntu-latest	1m 0s
-mysqlPy:3.12 - Tw:23.10 - ubuntu-latest	1m 1s
dbxs-required	1s
	18m 13s

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