Bump actions/upload-artifact from 5 to 6 in the actions group #106

Job	Run time
Psalm Static Analysis (PHP 8.3)	17s
PHPMD (PHP 8.3)	12s
PHPCS (PHP 8.3)	28s
WP VIP CS (PHP 8.3)	17s
PHPStan for WP (PHP 8.3)	23s
WP Plugin Check (PHP 8.3)	1m 50s
Security Scan (PHP 8.3)	20s
Test WordPress 6.5 with PHP 8.3	1m 6s
Test WordPress 6.5 with PHP 8.0	1m 46s
Test WordPress latest with PHP 8.3	1m 4s
Test WordPress 6.5 with PHP 8.4	1m 9s
Test WordPress 6.5 with PHP 7.4	1m 4s
Test WordPress latest with PHP 7.4	1m 6s
Test WordPress nightly with PHP 8.3	1m 13s
Test WordPress nightly with PHP 8.4	1m 10s
Test WordPress nightly with PHP 7.4	1m 34s
Test WordPress nightly with PHP 8.0	1m 9s
Test WordPress latest with PHP 8.4	1m 16s
Test WordPress latest with PHP 8.0	1m 16s
	18m 40s

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