Fix logging rules with whitespace around dot (#6022)

## Summary

Attempting to fix, e.g., `logging . warn("Hello World!")` was causing a
syntax error.

crates/ruff_python_stdlib/src/logging.rs

@@ -1,4 +1,4 @@
-#[derive(Copy, Clone)]
+#[derive(Debug, Copy, Clone)]
 pub enum LoggingLevel {
     Debug,
     Critical,