Add support for S3 Signature Version 4

[rogalv]

Broker is using a slightly outdated version of ECS Object Client library, which uses signature V2 to authenticate S3 endpoint requests. But there's a new release of that library, which enables support for V4 mode:
https://github.com/EMCECS/ecs-object-client-java/releases/tag/v3.4.0

Please, upgrade Object Client dependency and add an option to use signature V4 to communicate with ECS S3 endpoint.

[rogalv]

Included into 2.2.1 version. Thanks, @Mansur51-hub!