[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
---------------------+---------------------------------------
 Reporter:  mascguy  |      Owner:  ryandesign
     Type:  defect   |     Status:  assigned
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.8.1
 Keywords:           |       Port:  libpixman libpixman-devel
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 While upstream has marked these as pre-releases - whether intentionally or
 not - downstream projects like `cairo` are dependent on them. And
 upgrading the latter will require a newer release, for things like
 `pixman_dither_t`.

 We can start by updating `libpixman-devel`, to allow testing locally with
 the latest changes. And I'll submit a PR to get this moving along.

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