Bump matplotlib from 3.5.2 to 3.5.3 in /requirements (#707)

Bumps [matplotlib](https://github.com/matplotlib/matplotlib) from 3.5.2 to 3.5.3.
- [Release notes](https://github.com/matplotlib/matplotlib/releases)
- [Commits](https://github.com/matplotlib/matplotlib/compare/v3.5.2...v3.5.3)

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

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requirements/requirements.txt

@@ -1,7 +1,7 @@
 numpy == 1.23.2
 scipy == 1.9.0
 pandas == 1.4.3
-matplotlib == 3.5.2
+matplotlib == 3.5.3
 cvxpy == 1.2.1
 pytest == 7.1.2 # For unit test
 pytest-xdist == 2.5.0 # For unit test