Update pillow requirement from ==10.3.* to ==10.4.* in /server (#132)

Updates the requirements on [pillow](https://github.com/python-pillow/Pillow) to permit the latest version.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/main/CHANGES.rst)
- [Commits](python-pillow/Pillow@10.3.0...10.4.0)

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

server/requirements.txt

@@ -19,7 +19,7 @@ matplotlib==3.9.*
 numpy==2.1.*
 orjson==3.10.*
 openpyxl~=3.1.4
-Pillow==10.3.*
+Pillow==10.4.*
 pandas==2.2.*
 pdf2image==1.17.*
 pdfrw==0.4