Bump codecov/codecov-action from 3 to 4 #1674

Job	Run time
Pre run	3s
Lint: JS	0s
Lint: PHP	0s
Static Analysis: PHP	0s
Unit test: PHP 7.3, WP latest	1m 30s
Unit test: PHP 7.2, WP latest	1m 13s
Unit test: PHP 8.3, WP trunk	1m 11s
Unit test: PHP 8.2, WP trunk	1m 10s
Unit test: PHP 8.1, WP latest	1m 9s
Unit test: PHP 8.0, WP latest	1m 11s
Unit test: PHP 7.4, WP latest	1m 9s
Unit test (with coverage): PHP 7.4, WP latest	1m 38s
Unit test: PHP 7.2, WP 6.6	1m 8s
	11m 22s

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