Bump gvsbuild to a temporary branch using glib from git

Author: pbor

.github/workflows/windows.yml

@@ -14,7 +14,7 @@ jobs:
 
     env:
       # git revision of gvsbuild we use for to build GLib and the other dependencies
-      gvsbuildref: 1b3c28a3aa2312e7796f5f91b0a897a7a38b9292
+      gvsbuildref: de70bfe8f540249aafbf8247ac6886019262917f
 
       # bump this number if you want to force a rebuild of gvsbuild with the same revision
       gvsbuildupdate: 1