[gnome-sdk-images] WebKitGTK+ 2.21.3

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 2a3a7e53ea4ce93c432556eb623aaa37ac91a60b
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Mon May 28 10:08:53 2018 -0500

    WebKitGTK+ 2.21.3

 org.gnome.Sdk.json.in | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/org.gnome.Sdk.json.in b/org.gnome.Sdk.json.in
index ab89f1f..d3cb244 100644
--- a/org.gnome.Sdk.json.in
+++ b/org.gnome.Sdk.json.in
@@ -877,8 +877,8 @@
             "sources": [
                 {
                     "type": "archive",
-                    "url": "https://webkitgtk.org/releases/webkitgtk-2.21.2.tar.xz";,
-                    "sha256": "39eebeccc1d4de94a6750997ef52068308e31dc1de29a4537651df07d8067c9c"
+                    "url": "https://webkitgtk.org/releases/webkitgtk-2.21.3.tar.xz";,
+                    "sha256": "d30dc877f71af260f9f7ce0a75544ee9cc38747b3889023bf7ff4c83e8b2b8dd"
                 }
             ]
         },