Update submodules: plugins (new commits)

plugins:
    ed9da7f Chris Smith <chris@dmdirc.com>
            Don't construct ConfigManagers.

            Use a factory where available, and horrible singleton where not.

            (ConfigManager was using a horrible singleton anyway, under the hood,
             so it's not that much worse)

            Gerrit: http://gerrit.dmdirc.com/3080

Change-Id: Iab31bcc2885ac16d3c6237264928e8ce24d5cd60