Fix xmldiff formatter (#14855)

Author: kasium

stubs/xmldiff/xmldiff/main.pyi

@@ -41,21 +41,21 @@ _ACTIONS: TypeAlias = (
 _ET: TypeAlias = Any  # lxml.etree._ElementTree
 
 @overload
-def diff_trees(left: _ET, right: _ET, *, diff_options: dict[str, Any] | None = None, formatter: BaseFormatter = ...) -> str: ...
+def diff_trees(left: _ET, right: _ET, *, diff_options: dict[str, Any] | None = None, formatter: BaseFormatter) -> str: ...
 @overload
 def diff_trees(
     left: _ET, right: _ET, diff_options: dict[str, Any] | None = None, formatter: None = None
 ) -> Iterable[_ACTIONS]: ...
 @overload
 def diff_texts(
-    left: str | bytes, right: str | bytes, *, diff_options: dict[str, Any] | None = None, formatter: BaseFormatter = ...
+    left: str | bytes, right: str | bytes, *, diff_options: dict[str, Any] | None = None, formatter: BaseFormatter
 ) -> str: ...
 @overload
 def diff_texts(
     left: str | bytes, right: str | bytes, diff_options: dict[str, Any] | None = None, formatter: None = None
 ) -> Iterable[_ACTIONS]: ...
 @overload
-def diff_files(left: str, right: str, *, diff_options: dict[str, Any] | None = None, formatter: BaseFormatter = ...) -> str: ...
+def diff_files(left: str, right: str, *, diff_options: dict[str, Any] | None = None, formatter: BaseFormatter) -> str: ...
 @overload
 def diff_files(
     left: str, right: str, diff_options: dict[str, Any] | None = None, formatter: None = None