The choice of the hybridization of an atom in a compound is a freedom you have and not something that is determined by some scientific law. Why do you want to use hybrids at all in the description of this molecule? s orbitals are full and don't contribute to bonding in a first approximation.
The two p_z orbitals along the molecule axis (z-axis) form a sigma bond and the rest of the electrons occupy the p_x and p_y orbitals forming a two and a one electron pi bond.
Maybe bond energy increases somehow if you allow for some hybridization between the s and the p_z orbitals. However without quantum chemical calculations, it is hard to say to what extent hybridization will increase bond energy.