[MacPorts] #42372: openslide @3.4.0 Packaging update

[MacPorts]

#42372: openslide @3.4.0 Packaging update
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 Reporter:  bgilbert@…           |      Owner:  macports-tickets@…
     Type:  update               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:  2.2.1
 Keywords:  haspatch maintainer  |       Port:  openslide
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 The attached patch updates the openslide package to version 3.4.0.

 We hardcode `master_sites` for now, pending #42273.

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Ticket URL: <https://trac.macports.org/ticket/42372>
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