This update for apt-cacher-ng fixes the following issues:

- CVE-2019-18899: Fixed a symlink attack which could allow to overwrite arbitrary data (boo#1157703).
- CVE-2020-5202: Fixed an information leak if a local user won a race condition to listen to localhost:3142 (boo#1157706).

This update was imported from the openSUSE:Leap:15.1:Update update project.