Place the butternut squash on a sheet pan and drizzle with the olive oil. Sprinkle with the cinnamon, 2 teaspoons salt, and 1 teaspoon pepper. Toss with your hands and spread the squash out in one layer on the pan. Roast for 25 minutes, until tender, and set aside for 15 minutes to cool.
Reserve 1/4 cup of squash for the garnish and transfer the rest to the bowl of a food processor fitted with the steel blade. Add the chickpeas, yogurt, tahini, lemon juice, garlic, Sriracha, 1 tablespoon salt, and 1 teaspoon pepper and pulse until coarsely processed but not pureed. Add 1/4 cup of the reserved chickpea liquid and pulse a few times to combine. If the hummus is too thick, add more liquid a few tablespoons at a time. Taste for seasonings, transfer to a serving bowl, garnish with the reserved butternut squash, drizzle with maple syrup, if desired, and serve at room temperature with toasted pita bread.