Bump actions/upload-artifact from 5 to 6 in the actions group #113

Job	Run time
PHPCS (PHP 8.3)	19s
WP VIP CS (PHP 8.3)	20s
PHPMD (PHP 8.3)	13s
PHPStan for WP (PHP 8.3)	14s
WP Plugin Check (PHP 8.3)	1m 56s
Psalm Static Analysis (PHP 8.3)	22s
Security Scan (PHP 8.3)	19s
Test WordPress nightly with PHP 7.4	1m 0s
Test WordPress latest with PHP 8.0	1m 2s
Test WordPress 6.5 with PHP 8.4	1m 16s
Test WordPress nightly with PHP 8.3	1m 2s
Test WordPress 6.5 with PHP 8.3	1m 12s
Test WordPress latest with PHP 8.4	1m 2s
Test WordPress 6.5 with PHP 8.0	1m 7s
Test WordPress latest with PHP 7.4	1m 3s
Test WordPress nightly with PHP 8.4	1m 5s
Test WordPress 6.5 with PHP 7.4	1m 2s
Test WordPress nightly with PHP 8.0	1m 15s
Test WordPress latest with PHP 8.3	1m 5s
	16m 54s

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