[MacPorts] #68269: libpixman{,-devel}: update to latest release; currently 0.42.x; required by latest release of cairo

[MacPorts]

#68269: libpixman{,-devel}: update to latest release; currently 0.42.x; required by
latest release of cairo
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  Reporter:  mascguy                    |      Owner:  ryandesign
      Type:  update                     |     Status:  assigned
  Priority:  Normal                     |  Milestone:
 Component:  ports                      |    Version:  2.8.1
Resolution:                             |   Keywords:  haspatch
      Port:  libpixman libpixman-devel  |
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Comment (by mascguy):

 Replying to [comment:9 mascguy]:
 > I'll check to see whether there's already an upstream merge request,
 and/or issue. And if not, I'll submit a new issue.

 There didn't appear to be either. So I asked about the `pixman` required
 version, via the following merge request:

 [https://gitlab.freedesktop.org/cairo/cairo/-/merge_requests/511#note_2108021
 MR 511 - Enable access to the pixman dithering path]

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Ticket URL: <https://trac.macports.org/ticket/68269#comment:10>
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