Allow symfony 6.4 and fixing condition for valid "0" responses

[tecbird]

1. i found a bug for count api calls $iamAdminClient->users()->count('test', $criteria) => no user found it will return 0 (valid case)

2. symfony 6.4 should also work, we have some projects that are not currently at symfony 7.x

[mainick]

Thanks @tecbird and @Fahl-Design for the excellent work! I'm sorry, but I don't feel like applying the changes to the userInfo method, so could you please remove the comma 4b44bba? Then, I'll proceed with the merge to main.