Log Message:
databases/ruby-activeldap: update to 5.2.3

5.2.3: 2019-02-15

Improvements

* Changed to use add and delete for modify if it's needed.
  [GitHub#156][Patch by David Klotz]

* Added support for timezone with munites offset such as @0530@.
  [GitHub#160][GitHub#161][Patch by Neng Xu]

* Added support for Ruby 2.6.

Thanks

* David Klotz

* Neng Xu