chore: add license classifiers to pyproject.toml

Author: nijel

pyproject.toml

@@ -18,6 +18,11 @@ classifiers = [
   "Programming Language :: Python",
   "Programming Language :: Python :: 3",
   "Programming Language :: Python :: 3 :: Only",
+  "Programming Language :: Python :: 3.9",
+  "Programming Language :: Python :: 3.9",
+  "Programming Language :: Python :: 3.11",
+  "Programming Language :: Python :: 3.12",
+  "Programming Language :: Python :: 3.13",
   "Topic :: Software Development :: Internationalization",
   "Topic :: Software Development :: Localization",
   "Topic :: Utilities"