Just for this test, omitting Header to reduce irrelevant primer results

stdlib/email/message.pyi

@@ -65,7 +65,7 @@ class Message:
     def __iter__(self) -> Iterator[str]: ...
     # Same as `get` with `failobj=None`, but with the expectation that it won't return None in most scenarios
     # This is important for protocols using __getitem__, like SupportsKeysAndGetItem
-    def __getitem__(self, name: str) -> str | Header | Any: ...  # AnyOf[_HeaderType, None]
+    def __getitem__(self, name: str) -> str | Any: ...  # Just for this test, omitting Header to reduce irrelevant primer results
     def __setitem__(self, name: str, val: _HeaderTypeParam) -> None: ...
     def __delitem__(self, name: str) -> None: ...
     def keys(self) -> list[str]: ...