build(deps): bump cvxpy from 1.6.5 to 1.6.6 in /requirements

Bumps [cvxpy](https://github.com/cvxpy/cvxpy) from 1.6.5 to 1.6.6.
- [Release notes](https://github.com/cvxpy/cvxpy/releases)
- [Commits](cvxpy/cvxpy@v1.6.5...v1.6.6)

---
updated-dependencies:
- dependency-name: cvxpy
  dependency-version: 1.6.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements/requirements.txt

@@ -1,7 +1,7 @@
 numpy == 2.2.4
 scipy == 1.15.2
 matplotlib == 3.10.1
-cvxpy == 1.6.5
+cvxpy == 1.6.6
 ecos == 2.0.14
 pytest == 8.4.0 # For unit test
 pytest-xdist == 3.7.0 # For unit test