Update submodules: plugins (new commits)

plugins:
    965714a Shane Mc Cormack <shane@dmdirc.com>
            Fix scriptplugin causing massive cpu load and slowing everything in the client down. (Related: 118a2c05026183901cbc01a9452b0e47822bcbe1)

            Fixes-Issue: CLIENT-418
            Gerrit: http://gerrit.dmdirc.com/2962

Change-Id: Ib4edcccd00a51ec3bea128d0ce84dff29dfb690d