Add dates to allowed PHPDoc types of Builder::having()

[miken32]

Dates work fine in a having() clause; Illuminate\Database\Connection::prepareBindings() is explicitly checking for a \DateTimeInterface object so that's what I've used in the comment.

This prevents phpstan from complaining:

Parameter #3 $value of method Illuminate\Database\Query\Builder::having() expects float|int|string|null, Illuminate\Support\Carbon given. 

Related, I also noted (but didn't change) that Builder::havingBetween() is checking for a Carbon\CarbonPeriod instance, but should probably be checking for its ancestor \DatePeriod instance instead. This would maintain consistency with other checks later in the code.