feat: Test Rector to upgrade code for PHP 8.1 #161

Job	Run time
PHP 8.1 \| WP latest \| highest	2m 10s
PHP 8.1 \| WP latest \| lowest	2m 6s
PHP 8.1 \| WP latest (MS) \| highest	2m 32s
PHP 8.1 \| WP latest (MS) \| lowest	2m 52s
PHP 8.1 \| WP 6.2 \| highest	2m 38s
PHP 8.1 \| WP 6.2 \| lowest	2m 16s
PHP 8.1 \| WP 6.2 (MS) \| highest	2m 35s
PHP 8.1 \| WP 6.2 (MS) \| lowest	2m 35s
PHP 8.2 \| WP latest \| highest	2m 9s
PHP 8.2 \| WP latest \| lowest	2m 14s
PHP 8.2 \| WP latest (MS) \| highest	2m 41s
PHP 8.2 \| WP latest (MS) \| lowest	2m 30s
PHP 8.2 \| WP 6.2 \| highest	2m 27s
PHP 8.2 \| WP 6.2 \| lowest	2m 9s
PHP 8.2 \| WP 6.2 (MS) \| highest	2m 30s
PHP 8.2 \| WP 6.2 (MS) \| lowest	2m 46s
PHP 8.2 \| WP trunk \| highest	2m 18s
PHP 8.3 \| WP trunk \| highest	2m 33s
PHP 8.1 (Imagick) \| WP latest \| highest	2m 15s
PHP 8.1 (with coverage) \| WP latest \| highest	3m 55s
	50m 11s

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