Log Message:
databases/ruby-sequel: update to 5.29.0

Update ruby-sequel to 5.29.0.

=== 5.29.0 (2020-02-01)

* Recognize another disconnect error in the tinytds adapter (jeremyevans)

* Fix verbose warning in postgres adapter when using prepared statements and \ 
recent versions of ruby-pg (jeremyevans)

* Work correctly on Ruby 2.8+ by supporting second argument for initialize_clone \ 
(jeremyevans)

* Add empty_failure_backtraces plugin for empty backtraces for ValidationFailed \ 
and HookFailed exceptions, much faster on JRuby (jeremyevans)

* Add Dataset#json_serializer_opts to json_serializer plugin, allowing to set \ 
json_serializer options on a per-dataset basis (jeremyevans)