fix issue in python>=3.12

Author: Marcello-Sega

pytim/observables/contactangle.py

@@ -850,6 +850,7 @@ def _ellipse_general_to_canonical(coeffs, check_coeffs=True):
             phi += np.pi/2.
         # NOTE: don't change the units of phi to deg., other parts of the code
         #       depend on it being in rad.
+        phi = np.real_if_close(phi, tol=1000)
         phi = phi % np.pi
         return {'x0': x0.item(), 'y0': y0.item(), 'a': ap.item(), 'b': bp.item(), 'phi': phi.item(), 'e': e.item()}