Bump actions/upload-artifact from 3 to 4 #1531

Job	Run time
Pre run	4s
Feature tests: PHP ${{ matrix.php }}, WP ${{ matrix.wp }}	0s
E2E test: JS (1, 2)	10m 47s
Build: ${{ matrix.build }} build ZIP	0s
E2E test: JS (2, 2)	5m 21s
Lint: CSS	1m 12s
Lint: JS	1m 22s
Lint: PHP	46s
Static Analysis: PHP	47s
Unit test: JS	2m 37s
Unit test: PHP 8.0, WP latest	26s
Unit test: PHP 8.3, WP trunk	26s
Unit test: PHP 8.2, WP trunk	25s
Unit test: PHP 8.1, WP trunk	24s
Unit test: PHP 8.0, WP trunk	23s
Unit test (with coverage): PHP 8.0, WP latest	27s
Unit test: PHP 8.0, WP latest	26s
Unit test: PHP 7.4, WP latest	27s
Unit test: PHP 7.4, WP latest	21s
Unit test: PHP 7.4, WP 5.3	22s
Unit test: PHP 7.4, WP 5.3	20s
Upload plugin ZIPs to Google Cloud Storage	0s
Comment on PR with links to plugin ZIPs	0s
	27m 23s

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