Bump cvxsimulator from 0.9.14 to 0.9.15

Bumps [cvxsimulator](https://github.com/cvxgrp/simulator) from 0.9.14 to 0.9.15.
- [Release notes](https://github.com/cvxgrp/simulator/releases)
- [Commits](cvxgrp/simulator@v0.9.14...v0.9.15)

---
updated-dependencies:
- dependency-name: cvxsimulator
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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