build(deps): bump pandas from 2.0.2 to 2.1.1

Bumps [pandas](https://github.com/pandas-dev/pandas) from 2.0.2 to 2.1.1.
- [Release notes](https://github.com/pandas-dev/pandas/releases)
- [Commits](pandas-dev/pandas@v2.0.2...v2.1.1)

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

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -1,6 +1,6 @@
 matplotlib==3.7.1
 notebook==6.5.3
 numpy==1.24.3
-pandas==2.0.2
+pandas==2.1.1
 plotly==5.17.0
 scipy==1.10.1