Update submodules: plugins (new commits)

plugins:
    5fdc06f Chris Smith <chris@dmdirc.com>
            Fix up debug command tests.

            Gerrit: http://gerrit.dmdirc.com/2683

Change-Id: I030b1409128919366e1f1eede4daafcb6408287e

modules/plugins

@@ -1 +1 @@
-Subproject commit b3bc4cf09bdf343c73a5bf52e0c9d4e134999935
+Subproject commit 5fdc06f334cb222f6f41b301ff2e3317d44c368f