Bump pandas from 1.3.3 to 1.3.4 (#553)

Bumps [pandas](https://github.com/pandas-dev/pandas) from 1.3.3 to 1.3.4.
- [Release notes](https://github.com/pandas-dev/pandas/releases)
- [Changelog](https://github.com/pandas-dev/pandas/blob/master/RELEASE.md)
- [Commits](https://github.com/pandas-dev/pandas/compare/v1.3.3...v1.3.4)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -1,5 +1,5 @@
 numpy == 1.21.2
 scipy == 1.7.1
-pandas == 1.3.3
+pandas == 1.3.4
 matplotlib == 3.4.3
 cvxpy == 1.1.15