Set minimum version of Pandas to 2.1

We use DataFrame.map(...), which was introduced with that version.

Author: p-snft

pyproject.toml

@@ -49,7 +49,7 @@ classifiers = [
 requires-python = ">=3.10"
 dependencies = [
     "numpy >= 2.0",
-    "pandas >= 2.0",
+    "pandas >= 2.1",
 ]
 license = {text = "MIT"}