fix(rcb_query.cxx): add missing bucket_name to error message

The bucket_name parameter was missing from the fmt::format call in
cb_Backend_query_index_build_deferred, causing the error message
to not include the bucket name when reporting deferred index build
failures. Which in turn caused build failure with recent GCC, where
fmtlib tries to validate format strings compile-time.

Author: avsej

ext/rcb_query.cxx

@@ -536,8 +536,8 @@ cb_Backend_query_index_build_deferred(VALUE self,
         cb_throw_error(
           resp.ctx,
           fmt::format(R"(unable to build deferred indexes on the bucket "{}" ({}: {}))",
+                      req.bucket_name,
                       first_error.code,
-
                       first_error.message));
       } else {
         cb_throw_error(