Bump scipy from 1.9.0 to 1.9.1 in /requirements (#714)

Bumps [scipy](https://github.com/scipy/scipy) from 1.9.0 to 1.9.1.
- [Release notes](https://github.com/scipy/scipy/releases)
- [Commits](https://github.com/scipy/scipy/compare/v1.9.0...v1.9.1)

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

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requirements/requirements.txt

@@ -1,5 +1,5 @@
 numpy == 1.23.2
-scipy == 1.9.0
+scipy == 1.9.1
 pandas == 1.4.3
 matplotlib == 3.5.3
 cvxpy == 1.2.1