Exclude test_pprint from ruff formatting

Author: loic-simon

Lib/test/.ruff.toml

@@ -12,6 +12,7 @@ extend-exclude = [
     "test_annotationlib.py",
     "test_string/test_templatelib.py",
     "test_tstring.py",
+    "test_pprint.py",
     # New grammar constructions may not yet be recognized by Ruff,
     # and tests re-use the same names as only the grammar is being checked.
     "test_grammar.py",