[gnome-sdk-images] Bump gtkwebkit to latest unstable tarball.

[Alexander Larsson <alexl src gnome org>]

commit 8e59d183c9bae8b3e3c72ccaeedcfa7e379b3430
Author: Alexander Larsson <alexl redhat com>
Date:   Fri Sep 16 10:26:35 2016 +0200

    Bump gtkwebkit to latest unstable tarball.

 org.gnome.Sdk.json.in |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/org.gnome.Sdk.json.in b/org.gnome.Sdk.json.in
index 110dca7..e6d40bc 100644
--- a/org.gnome.Sdk.json.in
+++ b/org.gnome.Sdk.json.in
@@ -709,8 +709,8 @@
             "sources": [
                 {
                     "type": "archive",
-                    "url": "https://www.webkitgtk.org/releases/webkitgtk-2.13.4.tar.xz";,
-                    "sha256": "d044d656ed8c8ce7e64efa0eee7939f130d151c72612b51e4e002d9a4f3a3084"
+                    "url": "https://www.webkitgtk.org/releases/webkitgtk-2.13.92.tar.xz";,
+                    "sha256": "97db90daa1f7241eade79f91c0c94001a7ad4b17ebb0a1c5c0b7a8449dae94e0"
                 },
                 {
                     "type": "patch",