Bump pandas from 1.4.1 to 1.4.2 in /requirements (AtsushiSakai#654)

Bumps [pandas](https://github.com/pandas-dev/pandas) from 1.4.1 to 1.4.2.
- [Release notes](https://github.com/pandas-dev/pandas/releases)
- [Changelog](https://github.com/pandas-dev/pandas/blob/main/RELEASE.md)
- [Commits](pandas-dev/pandas@v1.4.1...v1.4.2)

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

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

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

Author: dependabot[bot]

requirements/requirements.txt

@@ -1,6 +1,6 @@
 numpy == 1.22.3
 scipy == 1.8.0
-pandas == 1.4.1
+pandas == 1.4.2
 matplotlib == 3.5.1
 cvxpy == 1.2.0
 pytest == 7.1.1 # For unit test