Bump cvxpy from 1.1.10 to 1.1.11 (#488)

Bumps [cvxpy](https://github.com/cvxgrp/cvxpy) from 1.1.10 to 1.1.11.
- [Release notes](https://github.com/cvxgrp/cvxpy/releases)
- [Changelog](https://github.com/cvxgrp/cvxpy/blob/master/CHANGELOG.md)
- [Commits](cvxgrp/cvxpy@v1.1.10...v1.1.11)

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Author: dependabot[bot]

requirements.txt

@@ -2,4 +2,4 @@ numpy == 1.20.1
 scipy == 1.6.1
 pandas == 1.2.2
 matplotlib == 3.3.4
-cvxpy == 1.1.10
+cvxpy == 1.1.11