Merge pull request #896 from wp-cli/fix/phpstan #624

Job	Run time
Build Phar	44s
Functional - WP trunk on PHP 7.4 with MySQL 5.6	6m 26s
Functional - WP latest on PHP 7.3 with MySQL 8.0	6m 46s
Functional - WP latest on PHP 8.5 with MySQL 8.0	4m 25s
Functional - WP trunk on PHP 7.4 with MySQL 5.7	5m 49s
Functional - WP latest on PHP 7.2 with MySQL 8.0	6m 33s
Functional - WP latest on PHP 7.4 with MySQL 8.0	6m 20s
Functional - WP trunk on PHP 7.4 with MySQL 8.0	6m 36s
Functional - WP trunk on PHP 8.5 with MySQL 5.6	4m 48s
Functional - WP trunk on PHP 8.5 with MySQL 8.0	4m 38s
Functional - WP trunk on PHP 8.5 with MySQL 5.7	4m 25s
Functional - WP 4.9 on PHP 7.2 with MySQL 5.6	6m 40s
Deployment	14s
Build DEB package	0s
Build RPM package	0s
	1h 4m 24s

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