[MacPorts] #62497: udunits2: update to 2.2.28

[MacPorts]

#62497: udunits2: update to 2.2.28
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 Reporter:  Dave-Allured  |      Owner:  tenomoto
     Type:  update        |     Status:  assigned
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:
 Keywords:                |       Port:  udunits2
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 * Update to 2.2.28.
 * This is a new stable release, not a development version.
 * Includes many build fixes, some might replace patches.
 * Source download URL has changed.  Fetch from repo, not Github.

 https://www.unidata.ucar.edu/downloads/udunits/
 https://artifacts.unidata.ucar.edu/repository/downloads-
 udunits/udunits-2.2.28.tar.gz

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Ticket URL: <https://trac.macports.org/ticket/62497>
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