No, the state of California did not file a lawsuits in federal court; the two homosexual parties did.
And it matters not which parties appealed at the next stage of the appellate process. If the SCOTUS dismisses the case for lack of jurisdiction, it will mandate that the entire federal case be dismissed.
IOW, Prop 8 will stand as passed by the people of California.
The state of CA don't want prop 8, so they are happy as a clam with the 9th circus ruling.
What standing do prop 8 supporters have to appeal to the USSC?
Once the state refused to defend what CA voters had passed they were screwed when it went to the 9th circus. They can't show how they are harmed.