Updated the `UpdateEndpointAuthProcedure_runs_via_mediator` test to use the `UpdateEndpointAuthDto` class for the `Data` property of the `UpdateEndpointAuthCommand`, improving clarity and aligning with the use of a dedicated DTO.
Added the necessary `using` directive for `ReC.Application.Common.Procedures.UpdateProcedure.Dto` to ensure the `UpdateEndpointAuthDto` class is accessible in the test file.