Drop python 3.8 and 3.9

Author: jenshnielsen

pyproject.toml

@@ -11,16 +11,14 @@ classifiers = [
     "Intended Audience :: Science/Research",
     "License :: OSI Approved :: MIT License",
     "Programming Language :: Python :: 3 :: Only",
-    "Programming Language :: Python :: 3.8",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
     "Topic :: Scientific/Engineering",
 ]
 license = {text = "MIT"}
-requires-python = ">=3.8"
+requires-python = ">=3.10"
 dependencies = [
     "pandas>=0.22",
     "xarray",