Update qgis to 3.8.2

Summary:
Changelog available here

Signed-off-by: Pierre-Yves <pyu@riseup.net>

Test Plan: Launch app, check a couple of plugins

Reviewers: Triage Team, JoshStrobl

Reviewed By: Triage Team, JoshStrobl

Differential Revision: https://dev.getsol.us/D7000

Former-commit-id: R2726:1bd60124968b