adds trove classifier for Python free-threading status

Author: ndgrigorian

pyproject.toml

@@ -29,6 +29,7 @@ classifiers = [
   "Programming Language :: Python :: 3.13",
   "Programming Language :: Python :: 3.14",
   "Programming Language :: Python :: Implementation :: CPython",
+  "Programming Language :: Python :: Free Threading :: 2 - Beta",
   "Topic :: Software Development",
   "Topic :: Scientific/Engineering",
   "Operating System :: Microsoft :: Windows",