[gtk/ebassi/boost-url] Update the URL for the Boost archive

[Emmanuele Bassi <ebassi src gnome org>]

commit 6c63f7b0e247c150067b72ee39509eacf1724632
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Thu May 13 11:29:22 2021 +0100

    Update the URL for the Boost archive
    
    The old URL seems to have failed, and now it returns 301.
    
    Use the URL from the Boost website.

 build-aux/flatpak/org.gtk.Demo4.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/build-aux/flatpak/org.gtk.Demo4.json b/build-aux/flatpak/org.gtk.Demo4.json
index 4adaff9da1..e009182e63 100644
--- a/build-aux/flatpak/org.gtk.Demo4.json
+++ b/build-aux/flatpak/org.gtk.Demo4.json
@@ -104,7 +104,7 @@
              "sources": [
                  {
                      "type": "archive",
-                     "url": "https://dl.bintray.com/boostorg/release/1.69.0/source/boost_1_69_0.tar.bz2";,
+                     "url": 
"https://boostorg.jfrog.io/artifactory/main/release/1.69.0/source/boost_1_69_0.tar.bz2";,
                      "sha256": "8f32d4617390d1c2d16f26a27ab60d97807b35440d45891fa340fc2648b04406"
                  }
             ]