v2021pre ← v2022dev1 backport: test-flatpak-demo: Fix demo version to install

Backport of !224 (merged)

Currently the flatpak demo repository contains 2 versions of the runtime and curl demo app: v2021dev1 and v2021pre. This commit forces flatpak to download the latest version, allowing to do it automatically.

added 2 commits

• b27c4768 - test-flatpak-demo: Fix demo version to install
• 82e5b06e - Release apertis-tests 0.2020.8

Compare with previous version

merged