Bump pillow from 3.4.2 to 12.2.0 in /Support/appveyor (BlueQuartzSoftware#1046)

Bumps [pillow](https://github.com/python-pillow/Pillow) from 3.4.2 to 12.2.0.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/main/CHANGES.rst)
- [Commits](python-pillow/Pillow@3.4.2...12.2.0)

---
updated-dependencies:
- dependency-name: pillow
  dependency-version: 12.2.0
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Support/appveyor/requirements-dev.txt

@@ -1,6 +1,6 @@
 pytest==3.0.6
 requests==2.20.0
-Pillow==3.4.2
+Pillow==12.2.0
 # Need this for testing so we can stop there server, change when the required
 # get into a release.
 https://github.com/bottlepy/bottle/archive/41ed6965.zip