[gnome-build-meta] Update to WebKitGTK 2.28.2

[Michael Catanzaro <mcatanzaro src gnome org>]

commit a2e5ecd980151d30454b0ac8ddfdb0a24237e5b0
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Fri Apr 24 17:57:40 2020 -0500

    Update to WebKitGTK 2.28.2

 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 19ba6519..1b49fd62 100644
--- a/elements/sdk/WebKitGTK.bst
+++ b/elements/sdk/WebKitGTK.bst
@@ -1,7 +1,7 @@
 kind: cmake
 sources:
 - kind: tar
-  url: webkitgtk_org:webkitgtk-2.28.1.tar.xz
+  url: webkitgtk_org:webkitgtk-2.28.2.tar.xz
 - kind: patch
   path: files/webkitgtk/gtk-doc-introspection-cross-compiling.patch
 - kind: local