Update cffi to 1.16.0

To fix error in Google Colab

Author: chris-s-bowden

setup.cfg

@@ -27,13 +27,13 @@ install_requires =
     numpy==1.22.4
     pandas>=1.3.5
     tqdm>=4.64.0
-    cffi==1.15.0
+    cffi==1.16.0
 setup_requires =
     numba>=0.56.0
     numpy==1.22.4
     pandas>=1.3.5
     tqdm>=4.64.0
-    cffi==1.15.0
+    cffi==1.16.0
 include_package_data = True
 packages = find:
 python_requires = >=3.7