A bank account requires a business license unless the treasurer wants to open account in their own name.
It's not worth it in my opinion. The important part of the treasury, I think, is to keep detailed records. That does not require a bank account.
Obviously, we are not a business, so the appropriate license would be for a non profit organization, which comes with a lot of extra administration including the need to file taxes.
All the people who want to deal with that, raise your hands. Nobody?

(My hand is not up, that's for sure!)
If we grow to the point of needing a non profit designation, so be it, but I really don't think we are there now, and getting the designation just to get a bank account would be putting the cart before the horse in my opinion.