Update openpyxl requirement from <4,>=3.1 to >=3.1.5,<4 (#40)

Updates the requirements on [openpyxl](https://openpyxl.readthedocs.io) to permit the latest version.

---
updated-dependencies:
- dependency-name: openpyxl
  dependency-version: 3.1.5
  dependency-type: direct:production
...

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requirements.txt

@@ -2,5 +2,5 @@ numpy>=2.4.6,<3
 pandas>=3.0.3,<4
 matplotlib>=3.10.9,<4
 scipy>=1.17.1,<2
-openpyxl>=3.1,<4
+openpyxl>=3.1.5,<4
 ipywidgets>=8.1.8,<9