[MacPorts] #60697: gdcm: Update to 3.0.6

[MacPorts]

#60697: gdcm: Update to 3.0.6
------------------------+---------------------------------
 Reporter:  ryandesign  |      Owner:  MarcusCalhoun-Lopez
     Type:  update      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  gdcm
------------------------+---------------------------------
 The gdcm port is outdated:

 {{{
 $ port livecheck gdcm
 gdcm seems to have been updated (port version: 3.0.5, new version: 3.0.6)
 }}}

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Ticket URL: <https://trac.macports.org/ticket/60697>
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