regenerate-meson: re-run with latest from sdbusplus

The sdbus++-gen-meson has a new version, which requires regenerating
all the meson in this repository.  Re-run the `regenerate-meson`
script.

Change-Id: Ic343ca3c074223f6cd869734414e0137a8b60807
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/gen/meson.build b/gen/meson.build
index a7da0a7..23394ac 100644
--- a/gen/meson.build
+++ b/gen/meson.build
@@ -5,10 +5,10 @@
     check: true,
 ).stdout().strip().split('\n')[0]
 
-if sdbuspp_gen_meson_ver != 'sdbus++-gen-meson version 5'
+if sdbuspp_gen_meson_ver != 'sdbus++-gen-meson version 6'
     warning('Generated meson files from wrong version of sdbus++-gen-meson.')
     warning(
-        'Expected "sdbus++-gen-meson version 5", got:',
+        'Expected "sdbus++-gen-meson version 6", got:',
         sdbuspp_gen_meson_ver
     )
 endif