MGASA-2021-0189 Updated thunderbird packages fix security vulnerabilities

An attacker may use Thunderbird's OpenPGP key refresh mechanism to poison an existing key CVE-2021-23991. A crafted OpenPGP key with an invalid user ID could be used to confuse the user CVE-2021-23992. Inability to send encrypted OpenPGP email after importing a crafted OpenPGP key CVE-2021-23993...