[MacPorts] #56928: rabbitmq-server @3.6.15_0 installed binary will not run with listed dependency erlang @21.0_0

[MacPorts]

#56928: rabbitmq-server @3.6.15_0 installed binary will not run with listed
dependency erlang @21.0_0
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  Reporter:  sarcas           |      Owner:  (none)
      Type:  defect           |     Status:  new
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:
Resolution:                   |   Keywords:
      Port:  rabbitmq-server  |
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Comment (by ostefano):

 In the meanwhile it would be nice to have a mechanism to pin a specific
 version of erlang, so to allow `upgrade outdate` scenarios gracefully.

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Ticket URL: <https://trac.macports.org/ticket/56928#comment:5>
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