[gnome-build-meta] Update to WebKitGTK 2.26.0

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 0b5749d2fab77e0b2b1e3252d7aa109fc01b7a08
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Mon Sep 9 18:28:06 2019 -0500

    Update to WebKitGTK 2.26.0

 elements/sdk/WebKitGTK.bst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/elements/sdk/WebKitGTK.bst b/elements/sdk/WebKitGTK.bst
index 2d6a55d2..7b08c01d 100644
--- a/elements/sdk/WebKitGTK.bst
+++ b/elements/sdk/WebKitGTK.bst
@@ -1,7 +1,7 @@
 kind: cmake
 sources:
 - kind: tar
-  url: webkitgtk_org:webkitgtk-2.25.92.tar.xz
+  url: webkitgtk_org:webkitgtk-2.26.0.tar.xz
 - kind: patch
   path: files/webkitgtk/gtk-doc-introspection-cross-compiling.patch
 - kind: local