Re-enable cz2 gpg key in secretstore.py

Change-Id: Iccefecccafe3748c310e5922f366c86d5f2cf11d
diff --git a/tools/secretstore.py b/tools/secretstore.py
index 55af48c..8ff5e2a 100644
--- a/tools/secretstore.py
+++ b/tools/secretstore.py
@@ -10,7 +10,7 @@
 keys = [
     "63DFE737F078657CC8A51C00C29ADD73B3563D82", # q3k
     "482FF104C29294AD1CAF827BA43890A3DE74ECC7", # inf
-    # "F07205946C07EEB2041A72FBC60C64879534F768", # cz2 (expired 2020-01-17)
+    "F07205946C07EEB2041A72FBC60C64879534F768", # cz2
     "0879F9FCA1C836677BB808C870FD60197E195C26", # implr
 ]