net/nmsg: Upgrade to version 1.3.0

nmsg (1.3.0):

  * Added external configuration for Kafka IO.

  * Stop IO when output fails.

  * Add support and API for statistics module.

  * Remove prometheus integration.

  * Add NMSG_STATSMOD_CONFIG environment variable.

  * Bug fixes.

  * Documentation fixes.

Bump PORTREVISION of dependent ports.

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