Don't bother validating Trove classifiers.

The list it uses isn't guaranteed to be installed, and can be out of date
anyway.

--- setuptools-80.9.0/setuptools/config/pyprojecttoml.py	2025-05-27 01:56:31.000000000 +0100
+++ setuptools-80.9.0/setuptools/config/pyprojecttoml.py	2025-06-03 11:26:11.344451328 +0100
@@ -41,6 +41,8 @@
 
 
 def validate(config: dict, filepath: StrPath) -> bool:
+    return True
+
     from . import _validate_pyproject as validator
 
     trove_classifier = validator.FORMAT_FUNCTIONS.get("trove-classifier")