Log Message:
mail/ruby-actionmailbox61: update to 6.1.5.1

## Rails 6.1.5.1 (April 26, 2022) ##

*   No changes.

## Rails 6.1.5 (March 09, 2022) ##

*   Add `attachments` to the list of permitted parameters for inbound emails \ 
conductor.

    When using the conductor to test inbound emails with attachments, this \ 
prevents an
    unpermitted parameter warning in default configurations, and prevents errors for
    applications that set:

    ```ruby
    config.action_controller.action_on_unpermitted_parameters = :raise
    ```

    *David Jones*, *Dana Henke*