Bump pillow from 10.2.0 to 10.3.0 in /examples/docker-flask (#634)

Bumps [pillow](https://github.com/python-pillow/Pillow) from 10.2.0 to 10.3.0.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/main/CHANGES.rst)
- [Commits](https://github.com/python-pillow/Pillow/compare/10.2.0...10.3.0)

---
updated-dependencies:
- dependency-name: pillow
  dependency-type: direct:production
...

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examples/docker-flask/requirements.txt

@@ -6,7 +6,7 @@ Flask==2.3.2
 itsdangerous==2.1.2
 Jinja2==3.1.3
 MarkupSafe==2.1.2
-Pillow==10.2.0
+Pillow==10.3.0
 pycups==2.0.1
 pypng==0.20220715.0
 pyserial==3.5