Fix test_clean_source for python 3.13.2

In python 3.13.2 untokenize() does not round-trip for code containing
line breaks (\ + \n). This patch removes the test case for the space
removal before line break.

python/cpython#125553

hypothesis-python/tests/cover/test_reflection.py

@@ -659,8 +659,10 @@ def test_param_called_within_defaults_on_error():
 
 def _prep_source(*pairs):
     return [
-        pytest.param(dedent(x).strip(), dedent(y).strip().encode(), id=f"case-{i}")
-        for i, (x, y) in enumerate(pairs)
+        pytest.param(
+            dedent(x).strip(), dedent(y).strip().encode(), id=f"case-{i}", marks=marks
+        )
+        for i, (x, y, *marks) in enumerate(pairs)
     ]
 
 
@@ -697,6 +699,10 @@ def      \\
             def\\
                 f(): pass
             """,
+            pytest.mark.skipif(
+                sys.version_info[:3] == (3, 13, 2),
+                reason="untokenize() does not round-trip for code with line breaks, gh-125553",
+            ),
         ),
         (
             """