Upgrade tor to 0.3.4 RC in Tails 3.9

Originally created by @intrigeri on #15772 (Redmine)

It should be released on August 15 so it’s probably not going to be packaged in time for 3.9~rc1. But for 3.9 final we should switch from the nightly build to the final release.

Feature Branch: feature/15772-tor-0.3.4.7-rc+force-all-tests

Related issues

Blocks tails/accounting#15334
Blocked by #15770 (closed)
Blocks #15480 (closed)
Copied to #15889 (closed)

Edited May 15, 2020 by intrigeri

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