more fixes

Simplify flattening of "ip_whitelist" config option

Apply changes due to new Psalm rules

Update gitsplit config for v7

Declare conflict with symfony/security-core v7

It is missing the Symfony\Component\Security\Core\Security class

Add "leeway" option, deprecate "window" option

Addresses issue scheb#201

Support for PHP8.3

Update php-cs-fixer config

Allow lcobucci/jwt v5

Psalm auto target php version 8 (inferred from composer.json)

Fix lcobucci/jwt ValidAt