Update submodules: plugins (new commits)

plugins:
    06271e5 Chris Smith <chris@dmdirc.com>
            Fix compilation error.

            I think I now live in dependency hell. It is not a nice place.

            Gerrit: http://gerrit.dmdirc.com/4009

Change-Id: I44e50dc3483b93d58043800f72fc64be6b4155f8