[MacPorts] #43183: glib2: update to 2.40.0

[MacPorts]

#43183: glib2: update to 2.40.0
--------------------+--------------------------
 Reporter:  cal@…   |      Owner:  ryandesign@…
     Type:  update  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:  2.2.1
 Keywords:          |       Port:  glib2
--------------------+--------------------------
 `gtk3` cannot be updated until `glib2` is updated:

 {{{
 Requested 'glib-2.0 >= 2.39.5' but version of GLib is 2.38.2
 }}}

 Please update `glib2` to the current version 2.40.0

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Ticket URL: <https://trac.macports.org/ticket/43183>
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