Fix appimage-builder package version query bug

See: https://github.com/AppImageCrafters/appimage-builder/issues/280

.gitlab-ci.yml

@@ -245,8 +245,12 @@ appimage-amd64:
     - wget https://github.com/AppImage/AppImageKit/releases/download/continuous/appimagetool-x86_64.AppImage -O /usr/local/bin/appimagetool && \
     - chmod +x /usr/local/bin/appimagetool
 
-    - python3 -m pip install --upgrade pip
-    - pip3 install appimage-builder
+    # Workaround for https://github.com/AppImageCrafters/appimage-builder/issues/280
+    - cd /tmp
+    - git clone https://github.com/AppImageCrafters/appimage-builder
+    - git checkout 9733877eed75aea0fa8e9a1cd26c22d77a10aa4a
+    - pip3 install .
+    - pip3 install cffi
 
     - /usr/sbin/update-ccache-symlinks
     - rm -rf ../.hunter &&  mv .hunter ../.hunter || true