fix cc examples

Author: fishjojo

examples/cc/20-raman.py

@@ -9,7 +9,7 @@
 '''
 import jax
 from pyscfad import gto, scf, cc
-from pyscfad.lib import numpy as np
+from pyscfad import numpy as np
 from pyscfad.prop.thermo import vib
 
 mol = gto.Mole()

examples/cc/21-ir.py

@@ -6,7 +6,7 @@
 '''
 import jax
 from pyscfad import gto, scf, cc
-from pyscfad.lib import numpy as np
+from pyscfad import numpy as np
 from pyscfad.prop.thermo import vib
 
 mol = gto.Mole()