[gnome-builder] build: bump dependencies for 3.21 development

[Christian Hergert <chergert src gnome org>]

commit 7059e9edb4e10fd8cdf73abfcf4673b3abf207d0
Author: Christian Hergert <christian hergert me>
Date:   Thu Apr 28 14:23:35 2016 -0700

    build: bump dependencies for 3.21 development

 configure.ac |   10 +++++-----
 1 files changed, 5 insertions(+), 5 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 24af84c..0e3c068 100644
--- a/configure.ac
+++ b/configure.ac
@@ -183,11 +183,11 @@ AC_SUBST(BUGREPORT_URL)
 dnl ***********************************************************************
 dnl Check for Required Packages
 dnl ***********************************************************************
-m4_define([gtk_required_version], [3.20.0])
-m4_define([glib_required_version], [2.47.92])
-m4_define([gtksourceview_required_version], [3.20.0])
-m4_define([gobject_introspection_version], [1.47.92])
-m4_define([pygobject_required_version], [3.19.3])
+m4_define([gtk_required_version], [3.21.1])
+m4_define([glib_required_version], [2.49.0])
+m4_define([gtksourceview_required_version], [3.21.1])
+m4_define([gobject_introspection_version], [1.48.0])
+m4_define([pygobject_required_version], [3.21.0])
 m4_define([libxml_required_version], [2.9.0])
 m4_define([pangoft2_required_version], [1.38.0])
 m4_define([peas_required_version], [1.18.0])