Fix license ID

Author: rlaboiss

pyproject.toml

@@ -12,7 +12,7 @@ classifiers = [
     "Framework :: Pelican",
     "Framework :: Pelican :: Plugins",
     "Intended Audience :: End Users/Desktop",
-    "License :: OSI Approved :: GNU Affero General Public License v3 or later (AGPLv3+)",
+    "License :: OSI Approved :: GNU Affero General Public License v3",
     "Operating System :: OS Independent",
     "Programming Language :: Python :: 3",
     "Programming Language :: Python :: 3.9",