Bump actions/upload-artifact from 5 to 6 in the actions group #127

Job	Run time
PHPMD (PHP 8.3)	17s
Security Scan (PHP 8.3)	23s
PHPStan for WP (PHP 8.3)	23s
WP Plugin Check (PHP 8.3)	2m 4s
PHPCS (PHP 8.3)	20s
WP VIP CS (PHP 8.3)	25s
Psalm Static Analysis (PHP 8.3)	23s
Test WordPress 6.5 with PHP 8.0	1m 9s
Test WordPress nightly with PHP 8.0	1m 11s
Test WordPress 6.5 with PHP 7.4	1m 12s
Test WordPress nightly with PHP 8.3	1m 8s
Test WordPress 6.5 with PHP 8.4	1m 8s
Test WordPress 6.5 with PHP 8.3	1m 34s
Test WordPress latest with PHP 8.4	1m 11s
Test WordPress nightly with PHP 7.4	1m 9s
Test WordPress latest with PHP 7.4	1m 17s
Test WordPress latest with PHP 8.3	1m 5s
Test WordPress latest with PHP 8.0	1m 14s
Test WordPress nightly with PHP 8.4	1m 10s
	18m 43s

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