[3.12] pythongh-131649: fix test_string_literals SyntaxWarning (pythonGH-131650) (pythonGH-131766) (python#131772)

[3.13] pythongh-131649: fix test_string_literals SyntaxWarning (pythonGH-131650) (pythonGH-131766)

(cherry picked from commit 2d83891)
(cherry picked from commit 5bcb476)

Co-authored-by: Brian Schubert <brianm.schubert@gmail.com>
Co-authored-by: Thomas Grainger <tagrain@gmail.com>

Author: 3 people

Lib/test/test_string_literals.py

@@ -172,7 +172,7 @@ def test_invalid_escape_locations_with_offset(self):
         with warnings.catch_warnings(record=True) as w:
             warnings.simplefilter('error', category=SyntaxWarning)
             with self.assertRaises(SyntaxError) as cm:
-                eval("\"'''''''''''''''''''''invalid\ Escape\"")
+                eval("\"'''''''''''''''''''''invalid\\ Escape\"")
             exc = cm.exception
         self.assertEqual(w, [])
         self.assertEqual(exc.msg, r"invalid escape sequence '\ '")
@@ -183,7 +183,7 @@ def test_invalid_escape_locations_with_offset(self):
         with warnings.catch_warnings(record=True) as w:
             warnings.simplefilter('error', category=SyntaxWarning)
             with self.assertRaises(SyntaxError) as cm:
-                eval("\"''Incorrect \ logic?\"")
+                eval("\"''Incorrect \\ logic?\"")
             exc = cm.exception
         self.assertEqual(w, [])
         self.assertEqual(exc.msg, r"invalid escape sequence '\ '")