build: Bump Meson dependency to 0.46.1

We don’t strictly require this, but given that our CI runs it, we
essentially never test with 0.46.0, so it might as well be broken.

Signed-off-by: Philip Withnall <withnall@endlessm.com>

meson.build

@@ -1,6 +1,6 @@
 project('glib', 'c', 'cpp',
   version : '2.57.1',
-  meson_version : '>= 0.46.0',
+  meson_version : '>= 0.46.1',
   default_options : [
     'buildtype=debugoptimized',
     'warning_level=1',