Preheat the oven to 350°. Butter and flour a 9-inch round cake pan. Line the bottom with parchment paper; butter and flour the paper. In a bowl, whisk the flour, salt, baking powder and baking soda. In a glass measuring cup, mix the apple cider with the canola oil and bourbon. In a large bowl, using an electric mixer, beat the butter until creamy. Add the brown sugar and vanilla seeds and beat until smooth. Add the eggs, 1 at a time, beating well between additions. Beat in the dry ingredients in 3 batches, alternating with the cider-bourbon mixture, until smooth.