Updated thunderbird packages fix security vulnerabilities

The updated packages fix security issues: Use-after-free when creating index updates in IndexedDB. (CVE-2019-11757) Potentially exploitable crash due to 360 Total Security. (CVE-2019-11758) Stack buffer overflow in HKDF output. (CVE-2019-11759) Stack buffer overflow in WebRTC networking. (CVE-2019-11760) Unintended access to a privileged JSONView object. (CVE-2019-11761) document.domain-based origin isolation has same-origin-property violation. (CVE-2019-11762) Incorrect HTML parsing results in XSS bypass technique. (CVE-2019-11763) Memory safety bugs fixed in Thunderbird 68.2. (CVE-2019-11764) Heap overflow in expat library in XML_GetCurrentLineNumber. (CVE-2019-15903) Enigmail has been updated to 2.1.3.