[gnome-sdk-images] Bump WebKitGTK to 2.16.2.

[Michael Gratton <mjog src gnome org>]

commit 997249a12b6435c9f4e7afa9b898c9373f038de1
Author: Michael James Gratton <mike vee net>
Date:   Wed May 10 11:23:46 2017 +1000

    Bump WebKitGTK to 2.16.2.
    
    Fixes Evolution and Geary lockups.

 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 1eda13a..6058a73 100644
--- a/org.gnome.Sdk.json.in
+++ b/org.gnome.Sdk.json.in
@@ -793,8 +793,8 @@
             "sources": [
                 {
                     "type": "archive",
-                    "url": "https://webkitgtk.org/releases/webkitgtk-2.16.1.tar.xz";,
-                    "sha256": "eb92383232328ce655b703c64370ed3795662479719ad1b4a869ed46769d2945"
+                    "url": "https://webkitgtk.org/releases/webkitgtk-2.16.2.tar.xz";,
+                    "sha256": "5ef689a202eb2b71141efbe8b7b53288adced90790f9f08df6e0a2ec1809f252"
                 },
                 {
                     "type": "patch",