Bump codecov/codecov-action from 3 to 4 #704

Job	Run time
Smoke test and building	46s
Check library dependencies ship with valid licenses	42s
Running documentation style checks	17s
Building library documentation	8m 16s
Test library (pytwin-win10, 3.9)	9m 57s
Test library (pytwin-win10, 3.10)	9m 56s
Test library (pytwin-win10, 3.11)	10m 0s
Test library (pytwin-win10, 3.12)	10m 7s
Test library (ubuntu-20.04, 3.9)	2m 19s
Test library (ubuntu-20.04, 3.10)	1m 41s
Test library (ubuntu-20.04, 3.11)	1m 46s
Test library (ubuntu-20.04, 3.12)	2m 1s
Deploy stable documentation	0s
Deploy developers documentation	0s
Release to public PyPI	0s
	57m 48s

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