Follow KDE_APPLICATIONS_VERSION

Summary:
Last version increase was 3 years ago and there's been more than 60
commits since, that proves we need auto-updating version by release
management

Reviewers: alexeymin

Reviewed By: alexeymin

Subscribers: alexeymin, #kde_applications, ltoscano, dfaure

Differential Revision: https://phabricator.kde.org/D22036