Migrate from android support libraries to androidx
Summary: Use the new AndroidX libraries instead of the legacy support libraries
Test Plan: Apply patch and verify everything works as before
Reviewers: KDE Connect, nicolasfella
Reviewed By: KDE Connect, nicolasfella
Subscribers: shubham, kdeconnect
Tags: KDE Connect
Differential Revision: https://phabricator.kde.org/D17818