Make ancestorClass option consistency to underscore #162

Job	Run time
PHPStan	18s
Twig-CS-Fixer	5s
PHP-CS-Fixer	8s
check	13s
PHP 8.1 tests (No Symfony specified)	17s
PHP 8.2 tests (No Symfony specified)	17s
PHP 8.3 tests (No Symfony specified)	18s
PHP 8.1 tests (Symfony 6)	14s
PHP 8.4 tests (No Symfony specified)	16s
PHP 8.1 tests (Lowest deps)	17s
PHP 8.4 tests (Dev deps)	18s
PHP 8.5 tests (No Symfony specified)	11s
	2m 52s

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