Fix typo in Lib/test/test_ast/test_ast.py (python#136767)

`ASTOptimiziationTests` -> `ASTOptimizationTests`

Author: hunterhogan

Lib/test/test_ast/test_ast.py

@@ -3545,7 +3545,7 @@ def test_show_empty_flag(self):
         self.check_output(source, expect, '--show-empty')
 
 
-class ASTOptimiziationTests(unittest.TestCase):
+class ASTOptimizationTests(unittest.TestCase):
     def wrap_expr(self, expr):
         return ast.Module(body=[ast.Expr(value=expr)])