In a large mixing bowl, whisk together the wholewheat flour, all-purpose flour, oats, baking powder, baking soda, cinnamon, and salt. In a separate medium mixing bowl, whisk together the eggs, maple syrup, milk, oil, and vanilla extract. Pour the wet mixture into the dry mixture and stir with a wooden spoon to combine. Gently fold in the zucchini, until just incorporated.