Bump matplotlib from 3.6.2 to 3.6.3 in /requirements (AtsushiSakai#778)

Bumps [matplotlib](https://github.com/matplotlib/matplotlib) from 3.6.2 to 3.6.3.
- [Release notes](https://github.com/matplotlib/matplotlib/releases)
- [Commits](matplotlib/matplotlib@v3.6.2...v3.6.3)

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

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Author: dependabot[bot]

requirements/requirements.txt

@@ -1,6 +1,6 @@
 numpy == 1.24.1
 scipy == 1.10.0
-matplotlib == 3.6.2
+matplotlib == 3.6.3
 cvxpy == 1.3.0
 pytest == 7.2.0 # For unit test
 pytest-xdist == 3.1.0 # For unit test