build(deps): bump cvxpy from 1.5.3 to 1.6.5 in /requirements

Bumps [cvxpy](https://github.com/cvxpy/cvxpy) from 1.5.3 to 1.6.5.
- [Release notes](https://github.com/cvxpy/cvxpy/releases)
- [Commits](cvxpy/cvxpy@v1.5.3...v1.6.5)

---
updated-dependencies:
- dependency-name: cvxpy
  dependency-version: 1.6.5
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements/requirements.txt

@@ -1,7 +1,7 @@
 numpy == 2.2.4
 scipy == 1.15.2
 matplotlib == 3.10.1
-cvxpy == 1.5.3
+cvxpy == 1.6.5
 pytest == 8.3.5 # For unit test
 pytest-xdist == 3.6.1 # For unit test
 mypy == 1.15.0 # For unit test