Bump pillow from 5.4.1 to 9.3.0 in /geoportal

Bumps [pillow](https://github.com/python-pillow/Pillow) from 5.4.1 to 9.3.0.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/main/CHANGES.rst)
- [Commits](python-pillow/Pillow@5.4.1...9.3.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

geoportal/upstream_requirements.txt

@@ -41,7 +41,7 @@ passwordgenerator # geoportal
 PasteScript==3.1.0  # geoportal pcreate
 pep8==1.7.1  # lint
 pep8-naming==0.8.2  # Lint
-Pillow==5.4.1  # Tile generation
+Pillow==9.3.0  # Tile generation
 polib==1.1.0  # i18n
 psycopg2-binary==2.7.7  # geoportal
 pycryptodome==3.7.3  # geoportal