Not sure it’s so simple that there’s an issue of Dina dimalchusa dina here
What would be the reason that its not?
I'm no posek, but what would be the heter to violate the lawful Order of the state Department of Health?
*The ban on sleepaway camps does not require anyone to violate halacha
*There is no pikuach nefesh which can be accomplished by violating the ban on sleepaway camps
*The ban has nothing to do with Judaism and does not target Jews
So why would you think that by violating this law a person is not oveir on dina d'malchusa dina?