chore: debug not warn for setup.py extraction error

lib/manager/pip_setup/extract.ts

@@ -83,7 +83,7 @@ export async function extractPackageFile(
   try {
     setup = await extractSetupFile(content, packageFile, config);
   } catch (err) {
-    logger.warn({ err, content, packageFile }, 'Failed to read setup.py file');
+    logger.debug({ err, content, packageFile }, 'Failed to read setup.py file');
   }
   if (!setup) {
     return null;