chore: set proper return types on build methods (#2976) #162

Job	Run time
PHP 8.1 \| WP latest \| highest	2m 18s
PHP 8.1 \| WP latest \| lowest	2m 9s
PHP 8.1 \| WP latest (MS) \| highest	2m 32s
PHP 8.1 \| WP latest (MS) \| lowest	2m 51s
PHP 8.1 \| WP 6.2 \| highest	2m 8s
PHP 8.1 \| WP 6.2 \| lowest	2m 7s
PHP 8.1 \| WP 6.2 (MS) \| highest	2m 38s
PHP 8.1 \| WP 6.2 (MS) \| lowest	2m 38s
PHP 8.2 \| WP latest \| highest	2m 16s
PHP 8.2 \| WP latest \| lowest	3m 17s
PHP 8.2 \| WP latest (MS) \| highest	2m 59s
PHP 8.2 \| WP latest (MS) \| lowest	3m 40s
PHP 8.2 \| WP 6.2 \| highest	2m 12s
PHP 8.2 \| WP 6.2 \| lowest	2m 11s
PHP 8.2 \| WP 6.2 (MS) \| highest	3m 2s
PHP 8.2 \| WP 6.2 (MS) \| lowest	3m 4s
PHP 8.2 \| WP trunk \| highest	2m 17s
PHP 8.3 \| WP trunk \| highest	2m 9s
PHP 8.1 (Imagick) \| WP latest \| highest	2m 20s
PHP 8.1 (with coverage) \| WP latest \| highest	4m 22s
	53m 10s

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