Pin Charmed Operator Framework version for charms

Change-Id: Iff5659151e5678298b72e54b7b22a375bc7b7ebf
Signed-off-by: Dario Faccin <dario.faccin@canonical.com>
(cherry picked from commit d0303f5fff9c744aa101767166e94277c9e3259f)
15 files changed