reduce exception message tested for py311 compat

Change-Id: I519d4a840fd456ea042a5b0735da183a1e340aa4

Author: zzzeek

test/test_exceptions.py

@@ -274,10 +274,7 @@ def test_tback_no_trace_from_py_file(self):
         html_error = exceptions.html_error_template().render_unicode(
             error=v, traceback=None
         )
-        assert (
-            "local variable 'y' referenced before assignment"
-            in html_error
-        )
+        assert "local variable 'y'" in html_error
 
     def test_tback_trace_from_py_file(self):
         t = self._file_template("runtimeerr.html")
@@ -287,10 +284,7 @@ def test_tback_trace_from_py_file(self):
         except:
             html_error = exceptions.html_error_template().render_unicode()
 
-        assert (
-            "local variable 'y' referenced before assignment"
-            in html_error
-        )
+        assert "local variable 'y'" in html_error
 
     def test_code_block_line_number(self):
         l = TemplateLookup()