Update git submodules

* Update docs/submodules/joid from branch 'master'
  - use the latest stable charm.

    Change-Id: I61d3aa7f2c53c1b4043a4eb12933a50f98e8a8f0
    Signed-off-by: Narinder Gupta <narinder.gupta@canonical.com>

diff --git a/docs/submodules/joid b/docs/submodules/joid
index 14ec79e..42d972f 160000 (submodule)
--- a/docs/submodules/joid
+++ b/docs/submodules/joid
@@ -1 +1 @@
-Subproject commit 14ec79edc1dae18d4d366a26f13f13b5747af610
+Subproject commit 42d972f661405d0851598deb21e09ebc8e7043c7