Upgrade Tor to 0.4.7.15
Tor 0.4.7.15 contains a major bugfix for onion services.
https://forum.torproject.org/t/stable-release-0-4-7-15-and-0-4-8-6/9292
This version contains an important fix for onion service regarding congestion control and its reliability. Apart from that, very minor bugfixes. We strongly recommend all onion service operators to update immediately.
Major bugfixes (onion service):
- Fix a reliability issue where services were expiring their introduction points every consensus update. This caused connectivity issues for clients caching the old descriptor and intro points. Bug reported and fixed by gitlab user @hyunsoo.kim676. Fixes bug 40858; bugfix on 0.4.7.5-alpha.