Upgrade Thunderbird to 60.4
Thunderbird 60.4.0 had no MFSA but according to some internal mailing list, the corresponding Firefox MFSA applies. https://www.mozilla.org/en-US/security/advisories/mfsa2018-30/#CVE-2018-12405 is probably the only really concerning one since we disable HTML by default.
Thunderbird 60.5.0 is being prepared.
Enable the feature-16261-thunderbird-60.4-force-all-tests APT overlay (refs: #16261).
- Assignee deleted (
Built an ISO and:
- manual tests: configured an IMAP account in the config wizard, checked email. Gone through the Enigmail config wizard. Verified that Enigmail and Torbirdy are enabled
- automated tests:
Please review once #16349 is also ready for QA (I've merged it into this branch, otherwise Jenkins tests abort due to inactivity for 1h).