gnome: Update minimum glib version for gdbus-codegen

The fix has landed upstream, and will be in the next glib stable
release. I have verified that it fixes the problem described in #3488
and that the 'frameworks/7 gnome' test passes now.

mesonbuild/modules/gnome.py

@@ -905,9 +905,8 @@ This will become a hard error in the future.''')
             cmd += ['--annotate'] + annotation
 
         # Added in https://gitlab.gnome.org/GNOME/glib/commit/e4d68c7b3e8b01ab1a4231bf6da21d045cb5a816 (2.55.2)
-        # --body | --header is broken: https://github.com/mesonbuild/meson/issues/3488
+        # Fixed in https://gitlab.gnome.org/GNOME/glib/commit/cd1f82d8fc741a2203582c12cc21b4dacf7e1872 (2.56.2)
-        # Disabled till glib is fixed.
+        if mesonlib.version_compare(self._get_native_glib_version(state), '>= 2.56.2'):
-        if mesonlib.version_compare(self._get_native_glib_version(state), '>= 9999'):
             targets = []
             install_header = kwargs.get('install_header', False)
             install_dir = kwargs.get('install_dir', state.environment.coredata.get_builtin_option('includedir'))