fix typing

see https://github.com/microsoft/pyright/issues/9025

src/refiners/fluxion/layers/chain.py

@@ -243,11 +243,15 @@ class Chain(ContextModule):
             raise ChainError(message) from None
 
     def forward(self, *args: Any) -> Any:
-        result: tuple[Any] | Any = None
+        result: Any = None
         intermediate_args: tuple[Any, ...] = args
         for name, layer in self._modules.items():
             result = self._call_layer(layer, name, *intermediate_args)
-            intermediate_args = (result,) if not isinstance(result, tuple) else result
+            if isinstance(result, tuple):
+                result = cast(tuple[Any], result)
+                intermediate_args = result
+            else:
+                intermediate_args = (result,)
 
         self._reset_context()
         return result