Whitelist the hacking/cherrypick script's use of python3

hacking/cherrypick.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python3
+#!/usr/bin/env python3
 
 import os
 import sys

test/sanity/code-smell/shebang.sh

@@ -7,12 +7,13 @@ grep '^#!' -rIn . \
     -e '^\./lib/ansible/modules/' \
     -e '^\./test/integration/targets/[^/]*/library/[^/]*:#!powershell$' \
     -e '^\./test/sanity/validate-modules/validate-modules:#!/usr/bin/env python2$' \
+    -e 'i^\./hacking/cherrypick.py:#!/usr/bin/env python3$' \
     -e ':#!/bin/sh$' \
     -e ':#!/bin/bash( -[eux]|$)' \
     -e ':#!/usr/bin/make -f$' \
     -e ':#!/usr/bin/env python$' \
     -e ':#!/usr/bin/env bash$' \
-    -e ':#!/usr/bin/env fish$'
+    -e ':#!/usr/bin/env fish$' \
 
 if [ $? -ne 1 ]; then
     echo "One or more file(s) listed above have an unexpected shebang."