[lldb][test] Un-XFAIL TestDataFormatterStdUnorderedMap.py for older Clang versions

Fixed in #156033

Author: Michael137

lldb/test/API/functionalities/data-formatter/data-formatter-stl/generic/unordered_map-iterator/TestDataFormatterStdUnorderedMap.py

@@ -124,11 +124,6 @@ def do_test_ptr(self):
         self.check_ptr_ptr("ptr5")
         self.check_ptr_ptr("ptr6")
 
-    @expectedFailureAll(
-        bugnumber="https://github.com/llvm/llvm-project/issues/146040",
-        compiler="clang",
-        compiler_version=["<", "21"],
-    )
     @add_test_categories(["libc++"])
     def test_ptr_libcxx(self):
         self.build(dictionary={"USE_LIBCPP": 1})