Réveillon Salad

Ingredients:1 1/2 cups (1-inch) cubed peeled fresh pumpkin (about 12 ounces)Cooking spray3/4 teaspoon kosher salt, divided1/2 teaspoon freshly ground black pepper, divided14 cups lightly packed gourmet salad greens3/4 cup golden raisins1/4 cup hard cider1 tablespoon sugar3 tablespoons fresh lemon juice3 tablespoons canola oil2 tablespoons Dijon mustard8 gingersnaps, crushed (about 2 ounces)