fixed: reportlab - incorrect type on function parameter

Author: Paulie-Aditya

stubs/reportlab/reportlab/platypus/doctemplate.pyi

@@ -250,7 +250,7 @@ class BaseDocTemplate:
     def handle_keepWithNext(self, flowables: list[Flowable]) -> None: ...
     def handle_flowable(self, flowables: list[Flowable]) -> None: ...
     def build(
-        self, flowables: list[Flowable], filename: str | IO[Bytes] | None = None, canvasmaker: _CanvasMaker = ...
+        self, flowables: list[Flowable], filename: str | IO[bytes] | None = None, canvasmaker: _CanvasMaker = ...
     ) -> None: ...
     def notify(self, kind: str, stuff: Any) -> None: ...
     def pageRef(self, label: str) -> None: ...