chore: eku requires python>=3.9

Author: Oisin-M

pyproject.toml

@@ -10,15 +10,14 @@ license = { text = "Apache License Version 2.0" }
 authors = [
   { name = "European Centre for Medium-Range Weather Forecasts (ECMWF)", email = "software.support@ecmwf.int" },
 ]
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 
 classifiers = [
   "Development Status :: 2 - Pre-Alpha",
   "Intended Audience :: Developers",
   "License :: OSI Approved :: Apache Software License",
   "Operating System :: OS Independent",
   "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",