Bump cvxpy from 1.1.18 to 1.2.0 in /requirements (#648)

Bumps [cvxpy](https://github.com/cvxpy/cvxpy) from 1.1.18 to 1.2.0.
- [Release notes](https://github.com/cvxpy/cvxpy/releases)
- [Commits](https://github.com/cvxpy/cvxpy/compare/v1.1.18...v1.2.0)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements/requirements.txt

@@ -2,7 +2,7 @@ numpy == 1.22.3
 scipy == 1.7.3
 pandas == 1.4.1
 matplotlib == 3.5.1
-cvxpy == 1.1.18
+cvxpy == 1.2.0
 pytest == 7.1.0 # For unit test
 pytest-xdist == 2.5.0 # For unit test
 mypy == 0.941 # For unit test