Fix JWTEventListener cookie name resolution crashing on invalid dummy… #1552

Job	Run time
PHP-CS-Fixer (PHP 8.5)	17s
PHPUnit (Symfony NEXT 8.2) (PHP 8.5)	54s
Behat (Symfony NEXT 8.2) (PHP 8.5)	4m 20s
Behat (Symfony 7.4) (PHP 8.5)	5m 21s
PHPUnit (Symfony 7.4) (PHP 8.5)	2m 26s
PHPUnit (Symfony 8.1) (PHP 8.5)	45s
PHPUnit (Symfony ^7.4) (PHP 8.5) (lowest dependencies)	36s
Behat (Symfony 8.1) (PHP 8.5)	4m 19s
Behat (Symfony ^7.4) (PHP 8.5) (lowest dependencies)	4m 42s
	23m 40s

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