build(deps): bump matplotlib from 3.10.1 to 3.10.6 in /requirements

Bumps [matplotlib](https://github.com/matplotlib/matplotlib) from 3.10.1 to 3.10.6.
- [Release notes](https://github.com/matplotlib/matplotlib/releases)
- [Commits](matplotlib/matplotlib@v3.10.1...v3.10.6)

---
updated-dependencies:
- dependency-name: matplotlib
  dependency-version: 3.10.6
  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 == 2.2.4
 scipy == 1.15.2
-matplotlib == 3.10.1
+matplotlib == 3.10.6
 cvxpy == 1.7.3
 ecos == 2.0.14
 pytest == 8.4.2 # For unit test