Fix FormTypeClass constraint constructor for Symfony 8.1 compatibility #1493

Job	Run time
Behat (Symfony ^7.4) (PHP 8.5) (lowest dependencies)	4m 23s
PHP-CS-Fixer (PHP 8.5)	14s
PHPUnit (Symfony 7.4) (PHP 8.5)	1m 43s
PHPUnit (Symfony 8.1) (PHP 8.5)	52s
Behat (Symfony NEXT 8.2) (PHP 8.5)	3m 56s
PHPUnit (Symfony NEXT 8.2) (PHP 8.5)	41s
PHPUnit (Symfony ^7.4) (PHP 8.5) (lowest dependencies)	41s
Behat (Symfony 8.1) (PHP 8.5)	4m 37s
Behat (Symfony 7.4) (PHP 8.5)	4m 34s
	21m 41s

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