increase lift3 CM tol for recent gmsh

flow/tests/lift3.py

@@ -89,7 +89,7 @@ def main():
         tests.add(CTest('CL', solver.Cl, 0.135, 5e-2))
         tests.add(CTest('CD', solver.Cd, 0.0062, 1e-2)) # Tranair (NF=0.0062, FF=0.0030), Panair 0.0035
         tests.add(CTest('CS', solver.Cs, 0.0121, 5e-2))
-        tests.add(CTest('CM', solver.Cm, -0.0278, 1e-2))
+        tests.add(CTest('CM', solver.Cm, -0.0278, 2.5e-2)) # gmsh 4.4: -0.0278 ;  gmsh 4.8: -0.027147
     else:
         raise Exception('Test not defined for this flow')
     tests.run()