MAINT: adding back Python 3.13 classifier (#12743)

* adding max_supported_python to pyproject-fmt config

Author: bsipocz

pyproject.toml

@@ -38,6 +38,7 @@ classifiers = [
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
     "Topic :: Software Development :: Libraries",
     "Topic :: Software Development :: Testing",
     "Topic :: Utilities",
@@ -313,6 +314,7 @@ ignore = "W009"
 
 [tool.pyproject-fmt]
 indent = 4
+max_supported_python = "3.13"
 
 [tool.pytest.ini_options]
 minversion = "2.0"