[gnome-contacts] meson: Use proper license

[Niels De Graef <nielsdg src gnome org>]

commit 90c4b5f10a68ce513e8a787cd256d5610d593a9c
Author: Maximiliano Sandoval R <msandova gnome org>
Date:   Fri Feb 18 15:26:15 2022 +0100

    meson: Use proper license

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index 11813bde..8d58324d 100644
--- a/meson.build
+++ b/meson.build
@@ -1,7 +1,7 @@
 project('gnome-contacts', [ 'vala', 'c' ],
   version: '42.alpha',
-  license: 'GPL2+',
   meson_version: '>= 0.50',
+  license: 'GPL-2.0-or-later',
 )
 
 gnome = import('gnome')