CVXPY 1.9.1

This patch release contains bug fixes and follow-up improvements for CVXPY 1.9.

Summary

This new release totaled 8 PRs from 3 contributors.

• @brunoficoxpress | #3334
• @PTNobel | #3332, #3335, #3338, #3340, #3341, #3345
• @terryweng03 | #3336