Build(deps): update matplotlib requirement from ~=3.7.1 to ~=3.9.1

Updates the requirements on [matplotlib](https://github.com/matplotlib/matplotlib) to permit the latest version.
- [Release notes](https://github.com/matplotlib/matplotlib/releases)
- [Commits](matplotlib/matplotlib@v3.7.1...v3.9.1)

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

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

requirements.txt

@@ -3,7 +3,7 @@ setuptools~=67.7.0
 pandas>=2.0.1
 numpy~=1.24.2
 nptyping~=2.5.0
-matplotlib~=3.7.1
+matplotlib~=3.9.1
 scipy~=1.10.1
 tqdm~=4.65.0
 torch~=2.0.1