requirements: update pandas requirement from <2.1.1 to <2.1.3

Updates the requirements on [pandas](https://github.com/pandas-dev/pandas) to permit the latest version.
- [Release notes](https://github.com/pandas-dev/pandas/releases)
- [Commits](pandas-dev/pandas@0.3.0...v2.1.2)

---
updated-dependencies:
- dependency-name: pandas
  dependency-type: direct:production
...

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

requirements.txt

@@ -13,7 +13,7 @@ networkx<3.3
 numpy>=1.21.0, <1.24.5
 optuna<3.4.0
 packaging<24.0
-pandas<2.1.1
+pandas<2.1.3
 pillow<10.2.0
 pint<0.22.0
 protobuf<3.20.4