Rerun regenerate-meson to increment version

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: I095d02650e2b5d3c7e9ca9d0422bec45f1a75ad8
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
diff --git a/gen/meson.build b/gen/meson.build
index b550c79..c63d829 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 7'
+if sdbuspp_gen_meson_ver != 'sdbus++-gen-meson version 8'
     warning('Generated meson files from wrong version of sdbus++-gen-meson.')
     warning(
-        'Expected "sdbus++-gen-meson version 7", got:',
+        'Expected "sdbus++-gen-meson version 8", got:',
         sdbuspp_gen_meson_ver
     )
 endif