Updated thunderbird packages fix security vulnerabilities

This update provides an update to thunderbird 68.0, updates enigmail to 2.1.2 and fixes the following security issues: Memory safety bugs fixed in Firefox 68, Firefox ESR 60.8, and Thunderbird 68. (CVE-2019-11709) Memory safety bugs fixed in Firefox 68 and Thunderbird 68. (CVE-2019-11710) Script injection within domain through inner window reuse. (CVE-2019-11711) Cross-origin POST requests can be made with NPAPI plugins by following 308 redirects. (CVE-2019-11712) Use-after-free with HTTP/2 cached stream. (CVE-2019-11713) NeckoChild can trigger crash when accessed off of main thread. (CVE-2019-11714) HTML parsing error can contribute to content XSS. (CVE-2019-11715) globalThis not enumerable until accessed. (CVE-2019-11716) Caret character improperly escaped in origins. (CVE-2019-11717) Out-of-bounds read when importing curve25519 private key. (CVE-2019-11719) Character encoding XSS vulnerability. (CVE-2019-11720) Domain spoofing through unicode latin ‘kra’ character. (CVE-2019-11721) Cookie leakage during add-on fetching across private browsing boundaries. (CVE-2019-11723) Retired site input.mozilla.org has remote troubleshooting permissions. (CVE-2019-11724) Websocket resources bypass safebrowsing protections. (CVE-2019-11725) PKCS#1 v1.5 signatures can be used for TLS 1.3. (CVE-2019-11727) Port scanning through Alt-Svc header. (CVE-2019-11728) Empty or malformed p256-ECDH public keys may trigger a segmentation fault. (CVE-2019-11729) Same-origin policy treats all files in a directory as having the same-origin. (CVE-2019-11730) NOTE! If your lightning calendar disappears with this update, see the referenced support.mozilla.org link in the advisories.