Bump pillow

Bumps the pip group with 1 update in the /assembler_tools/hec-assembler-tools directory: [pillow](https://github.com/python-pillow/Pillow).


Updates `pillow` from 10.3.0 to 12.1.1
- [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...12.1.1)

---
updated-dependencies:
- dependency-name: pillow
  dependency-version: 12.1.1
  dependency-type: direct:production
  dependency-group: pip
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

assembler_tools/hec-assembler-tools/requirements.txt

@@ -7,7 +7,7 @@ matplotlib==3.7.1
 networkx==3.0
 numpy==1.24.2
 packaging==23.0
-Pillow==10.3.0
+Pillow==12.1.1
 pytest==8.4.0
 python-dateutil==2.8.2
 PyYAML==6.0