[pytz] Annotate parameter fill_iter (#14989)

Author: lev-blit

stubs/pytz/pytz/lazy.pyi

@@ -13,8 +13,8 @@ class LazyDict(DictMixin[str, _VT]):
 
 class LazyList(list[_T]):
     # does not return `Self` type:
-    def __new__(cls, fill_iter=None) -> LazyList[_T]: ...
+    def __new__(cls, fill_iter: _T | None = None) -> LazyList[_T]: ...
 
 class LazySet(set[_T]):
     # does not return `Self` type:
-    def __new__(cls, fill_iter=None) -> LazySet[_T]: ...
+    def __new__(cls, fill_iter: _T | None = None) -> LazySet[_T]: ...