[d-spy] build: specify branch

[Christian Hergert <chergert src gnome org>]

commit a63d660cd63d28e62f8994aee7d59fd4c1b251b6
Author: Christian Hergert <chergert redhat com>
Date:   Tue Oct 5 13:55:50 2021 -0700

    build: specify branch

 org.gnome.dspy.devel.json | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/org.gnome.dspy.devel.json b/org.gnome.dspy.devel.json
index 0b48ebb..158ce68 100644
--- a/org.gnome.dspy.devel.json
+++ b/org.gnome.dspy.devel.json
@@ -68,7 +68,8 @@
             "sources": [
                 {
                     "type": "git",
-                    "url": "https://gitlab.gnome.org/GNOME/d-spy.git";
+                    "url": "https://gitlab.gnome.org/GNOME/d-spy.git";,
+                    "branch" : "main"
                 }
             ]
         }