Updating thunderbird from 68 to 78 in focal

[Robie Basak]

Just to wrap this up from a TB perspective, we've taken the TB's
consensus to be what Marc suggested in this thread, and this was
discussed at the TB meeting of 26 January[0]. We further agreed in that
meeting that we would like the decision to be documented, but left open
exactly how that would happen.

Olivier and I worked together on some documentation and Olivier posted
this to Discourse[1] yesterday. Wearing my SRU team hat, I've been
working on a few review iterations on the updated packages with Olivier,
and should be able to land this soon into focal-proposed and then,
assuming SRU verification goes well, into focal-updates.

Thanks Olivier for driving this!

Robie

[0] https://new.ubottu.com/meetingology/logs/ubuntu-meeting/2021/ubuntu-meeting.2021-01-26-19.59.html
[1] https://discourse.ubuntu.com/t/thunderbird-lts-update/20819
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