[gnome-build-meta/jjardon/GNOME_3_33_4] Downgrade to gtk-doc 1.29

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 46fd230ecf746d4783a0cdefc2cce5cb2c62b04f
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Fri Jul 19 16:45:46 2019 -0500

    Downgrade to gtk-doc 1.29
    
    1.30 release is busted, see gtk-doc#84

 elements/sdk/gtk-doc.bst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/elements/sdk/gtk-doc.bst b/elements/sdk/gtk-doc.bst
index 9b0c5f6e..0c676e78 100644
--- a/elements/sdk/gtk-doc.bst
+++ b/elements/sdk/gtk-doc.bst
@@ -1,7 +1,7 @@
 kind: autotools
 sources:
 - kind: tar
-  url: gnome_downloads:gtk-doc/1.30/gtk-doc-1.30.tar.xz
+  url: gnome_downloads:gtk-doc/1.29/gtk-doc-1.29.tar.xz
 depends:
 - filename: sdk/python-pygments.bst
   type: runtime