Bump pandas from 1.4.3 to 1.4.4 in /requirements (#718)

Bumps [pandas](https://github.com/pandas-dev/pandas) from 1.4.3 to 1.4.4.
- [Release notes](https://github.com/pandas-dev/pandas/releases)
- [Changelog](https://github.com/pandas-dev/pandas/blob/main/RELEASE.md)
- [Commits](https://github.com/pandas-dev/pandas/compare/v1.4.3...v1.4.4)

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

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requirements/requirements.txt

@@ -1,6 +1,6 @@
 numpy == 1.23.2
 scipy == 1.9.1
-pandas == 1.4.3
+pandas == 1.4.4
 matplotlib == 3.5.3
 cvxpy == 1.2.1
 pytest == 7.1.3 # For unit test