Log Message:
databases/ruby-activeldap: update to 6.0.3

Update ruby-activeldap to 6.0.3.

## 6.0.3: 2020-08-17 {#release-6-0-3}

### Improvements

  * Added support for `save(validate: false)`.
    [GitHub#180][Reported by Kevin McCormack]

  * jndi: Added support for follow referrals.
    [GitHub#182][Patch by Kevin McCormack]

### Fixes

  * Fixed a bug that sub base is ignored in DN specified by `new`.
    [GitHub#185][Reported by Kevin McCormack]

### Thanks

  * Kevin McCormack