[MacPorts] #46404: grib_api @1.12.3_0: replace Python variants with +python27

[MacPorts]

#46404: grib_api @1.12.3_0: replace Python variants with +python27
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 Reporter:  larryv@…     |      Owner:  takeshi@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  grib_api
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 Same motivation as #46401.

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Ticket URL: <https://trac.macports.org/ticket/46404>
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