Updated gnupg2 packages fix security vulnerability

gnupg2 is updated to 2.2.18 and fix security vulnerability: Web of Trust forgeries using collisions in SHA-1 signatures (CVE-2019-14855) * Note that this change removes all SHA-1 based key signature newer than 2019-01-19 from the web-of-trust. This includes all key signature created with dsa1024 keys. The new option --allow-weak-key-signatues can be used to override the new and safer behaviour. For other fixes in this update, see the gnupg-announce reference.