Add explicit support for Python 3.14 (#771)

Tested manually.
The enterprise test suit passes without errors.

Author: yuce

setup.py

@@ -38,6 +38,7 @@
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
         "Programming Language :: Python :: 3.13",
+        "Programming Language :: Python :: 3.14",
         "Programming Language :: Python :: Implementation :: CPython",
         "Topic :: Software Development :: Libraries :: Python Modules",
     ],