Added 3.14 to metadata of supported versions

Author: Sylvain MARIE

setup.cfg

@@ -24,6 +24,7 @@ classifiers =
     Programming Language :: Python :: 3.11
     Programming Language :: Python :: 3.12
     Programming Language :: Python :: 3.13
+    Programming Language :: Python :: 3.14
 
 [options]
 # one day these will be able to come from requirement files, see https://github.com/pypa/setuptools/issues/1951. But will it be better ?