[MacPorts] #56081: glib2, glib2-devel: update to latest stable release 2.56.0

[MacPorts]

#56081: glib2, glib2-devel: update to latest stable release  2.56.0
---------------------+--------------------------------
 Reporter:  dbevans  |      Owner:  ryandesign
     Type:  update   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:
 Keywords:           |       Port:  glib2, glib2-devel
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 Required by gobject-introspectioin 2.56.0 and its dependents to support
 much of the current GNOME 3.28.0 release.

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Ticket URL: <https://trac.macports.org/ticket/56081>
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