add 3.14 into the classifiers

Author: hideaki-t

pyproject.toml

@@ -31,6 +31,7 @@ classifiers = [
   "Programming Language :: Python :: 3.11",
   "Programming Language :: Python :: 3.12",
   "Programming Language :: Python :: 3.13",
+  "Programming Language :: Python :: 3.14",
   "Programming Language :: Python :: Implementation :: PyPy",
   "Programming Language :: Python :: Implementation :: CPython",
   "Topic :: Database",