Update submodules: plugins (new commits)

plugins:
    8131779 Chris Smith <chris@dmdirc.com>
            Don't access PerformWrapper statically.

            Gerrit: http://gerrit.dmdirc.com/2726

Change-Id: I76f702eb3afe730162f80a91f143f60a6674778e

modules/plugins

@@ -1 +1 @@
-Subproject commit 64ff4ac4a8248e12f96d34d7dfd5725d2502bae4
+Subproject commit 81317792d86295cdc5e03f81153b14d3a6c28f43