[gnome-continuous] Update the version of Meson

[Emmanuele Bassi <ebassi src gnome org>]

commit 6aa726580c58fab5dbd032afa89e2d896b1038d8
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Thu Oct 11 20:43:13 2018 +0100

    Update the version of Meson
    
    We're going to need it when switching GLib to the Meson build.

 manifest.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/manifest.json b/manifest.json
index 588f1d3..59b2ac0 100644
--- a/manifest.json
+++ b/manifest.json
@@ -67,7 +67,7 @@
 
                 {"src": "git:https://github.com/mesonbuild/meson.git";,
                  "name": "meson",
-                 "tag": "0.47.2",
+                 "tag": "0.48.0",
                  "component": "devel",
                  "patches": ["python-meson-buildsys.patch"]},