Bump cvxpy from 1.2.0 to 1.2.1 in /requirements (#680)

Bumps [cvxpy](https://github.com/cvxpy/cvxpy) from 1.2.0 to 1.2.1.
- [Release notes](https://github.com/cvxpy/cvxpy/releases)
- [Commits](https://github.com/cvxpy/cvxpy/compare/v1.2.0...v1.2.1)

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

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requirements/requirements.txt

@@ -2,7 +2,7 @@ numpy == 1.22.3
 scipy == 1.8.0
 pandas == 1.4.2
 matplotlib == 3.5.2
-cvxpy == 1.2.0
+cvxpy == 1.2.1
 pytest == 7.1.2 # For unit test
 pytest-xdist == 2.5.0 # For unit test
 mypy == 0.950 # For unit test