port to ECM's FindCanberra
Summary:
- bump required kf5 version to 5.56
- use new VERSION var in FindCanberraPulse
- use new imported target when linking
Test Plan: cmake && make successful
Reviewers: apol
Reviewed By: apol
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D19382