Drop Python3.5, build 3.9

.gitlab-ci.yml

@@ -48,10 +48,6 @@ ubuntu20.04:
 ubuntu20.04_ppc64le:
   extends: .ubuntu_20_04_ppc64le
 
-
-macos_wheel_python35:
-  extends: .macos_wheel_python35
-
 macos_wheel_python36:
   extends: .macos_wheel_python36
 
@@ -61,6 +57,9 @@ macos_wheel_python37:
 macos_wheel_python38:
   extends: .macos_wheel_python38
 
+macos_wheel_python39:
+  extends: .macos_wheel_python39
+
 # Test
 
 .test_ppc64le_template: &test_ppc64le_template_defintion