dep: bump matplotlib from 3.8.3 to 3.8.4

Bumps [matplotlib](https://github.com/matplotlib/matplotlib) from 3.8.3 to 3.8.4.
- [Release notes](https://github.com/matplotlib/matplotlib/releases)
- [Commits](matplotlib/matplotlib@v3.8.3...v3.8.4)

---
updated-dependencies:
- dependency-name: matplotlib
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

requirements.txt

@@ -13,7 +13,7 @@ pytz == 2024.1
 
 tzlocal == 5.2
 
-matplotlib == 3.8.3
+matplotlib == 3.8.4
 Pillow == 10.3.0
 
 PyNaCl