Update classifiers in pyproject.toml

Removed Django 5.1 classifier and added Free Threading support.

Author: kingbuzzman

pyproject.toml

@@ -22,7 +22,6 @@ classifiers = [
     "Development Status :: 5 - Production/Stable",
     "Framework :: Django",
     "Framework :: Django :: 4.2",
-    "Framework :: Django :: 5.1",
     "Framework :: Django :: 5.2",
     "Framework :: Django :: 6.0",
     "Intended Audience :: Developers",
@@ -34,6 +33,7 @@ classifiers = [
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
     "Programming Language :: Python :: 3.14",
+    "Programming Language :: Python :: Free Threading",
     "Programming Language :: Python :: Implementation :: CPython",
     "Programming Language :: Python :: Implementation :: PyPy",
     "Topic :: Software Development :: Testing",