support/scripts/cpedb.py: remove import pickle

pickle is no longer used since 09a71e6a75636

Fixes:
support/scripts/cpedb.py:7:1: F401 'pickle' imported but unused

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
(cherry picked from commit 74cfd3aeb7350a7be39f2d43b35273beba57f9c7)

support/scripts/cpedb.py

@@ -4,7 +4,6 @@ import xml.etree.ElementTree as ET
 from xml.etree.ElementTree import Element, SubElement
 import gzip
 import os
-import pickle
 import requests
 import time
 from xml.dom import minidom