[4.2.x] Fixed #34459 -- Fixed SearchVector() crash for parameters with % symbol.

Thanks Patryk Zawadzki for the report.

Regression in 09ffc5c121.

Backport of 4bf4222010 from main

tests/postgres_tests/test_search.py

@@ -160,6 +160,12 @@ class SearchVectorFieldTest(GrailTestData, PostgreSQLTestCase):
         )
         self.assertNotIn("COALESCE(COALESCE", str(searched.query))
 
+    def test_values_with_percent(self):
+        searched = Line.objects.annotate(
+            search=SearchVector(Value("This week everything is 10% off"))
+        ).filter(search="10 % off")
+        self.assertEqual(len(searched), 9)
+
 
 class SearchConfigTests(PostgreSQLSimpleTestCase):
     def test_from_parameter(self):