Bump matplotlib from 3.8.1 to 3.8.2 in /requirements

Bumps [matplotlib](https://github.com/matplotlib/matplotlib) from 3.8.1 to 3.8.2.
- [Release notes](https://github.com/matplotlib/matplotlib/releases)
- [Commits](matplotlib/matplotlib@v3.8.1...v3.8.2)

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

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

Author: dependabot[bot]

requirements/requirements.txt

@@ -1,6 +1,6 @@
 numpy == 1.26.2
 scipy == 1.11.4
-matplotlib == 3.8.1
+matplotlib == 3.8.2
 cvxpy == 1.4.1
 pytest == 7.4.3 # For unit test
 pytest-xdist == 3.4.0 # For unit test