Bump actions/upload-artifact from 4.5.0 to 4.6.0 #11836

Job	Run time
Pre run	5s
Lint: CSS	57s
Lint: JS	1m 4s
Static Analysis: PHP	1m 13s
Lint: PHP	44s
E2E test: JS (1, 2)	5m 31s
E2E test: JS (2, 2)	4m 46s
Unit test: JS	1m 6s
Unit test: PHP 8.0, WP latest	31s
Feature tests: PHP ${{ matrix.php }}, WP ${{ matrix.wp }}	0s
Unit test: PHP 8.4, WP trunk	33s
Unit test: PHP 8.3, WP trunk	29s
Unit test: PHP 8.2, WP trunk	33s
Unit test: PHP 8.1, WP trunk	1m 24s
Unit test: PHP 8.0, WP trunk Multisite	1m 9s
Unit test (with coverage): PHP 8.0, WP latest	31s
Unit test: PHP 8.0, WP latest , Testsuite: external-http	36s
Unit test: PHP 7.4, WP latest Multisite	29s
Unit test: PHP 7.4, WP latest , Testsuite: external-http	37s
Unit test: PHP 7.4, WP 6.6	33s
Unit test: PHP 7.4, WP 6.6 , Testsuite: external-http	32s
	23m 23s

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