[MacPorts] #38409: Update Portfile for The Silver Searcher to indicate openmaintainer

[MacPorts]

#38409: Update Portfile for The Silver Searcher to indicate openmaintainer
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 Reporter:  brian.andrew@…       |      Owner:  macports-tickets@…
     Type:  update               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:  2.1.3
 Keywords:  haspatch maintainer  |       Port:  the_silver_searcher
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 On the recommendation of cal and some additional reading, I'm submitting
 this patch to list openmaintainer for the_silver_searcher.

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Ticket URL: <https://trac.macports.org/ticket/38409>
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