update python versioning

Author: zm711

codemeta.json

@@ -23,7 +23,7 @@
   "programmingLanguage": ["Python"],
   "operatingSystem": ["Linux", "Windows", "macOS"],
   "softwareRequirements": [
-    "Python (version 3.9+)",
+    "Python (version 3.10+)",
     "see https://github.com/NeuralEnsemble/python-neo/blob/master/pyproject.toml"
   ],
   "relatedLink": ["https://neo.readthedocs.io", "https://neuralensemble.org/community"],

pyproject.toml

@@ -13,7 +13,6 @@ classifiers = [
     "Intended Audience :: Science/Research",
     "Natural Language :: English",
     "Topic :: Scientific/Engineering",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",