remove pipe symbol for compatibility with older python versions

ariadne/asgi/handlers/http.py

@@ -93,7 +93,7 @@ async def handle(self, scope: Scope, receive: Receive, send: Send) -> None:
         response = await self.handle_request(request)
         await response(scope, receive, send)
 
-    async def handle_request_override(self, request: Request) -> Response | None:
+    async def handle_request_override(self, request: Request) -> Optional[Response]:
         """Override the default request handling logic in subclasses.
         Is called in the `handle_request` method before the default logic.
         If None is returned, the default logic is executed.

ariadne/contrib/sse.py

@@ -302,7 +302,7 @@ def __init__(
         self.ping_interval = ping_interval
         self.default_response_headers = default_response_headers
 
-    async def handle_request_override(self, request: Request) -> Response | None:
+    async def handle_request_override(self, request: Request) -> Optional[Response]:
         """Overrides the handle_request_override method to handle Server-Sent Events
 
         # Required arguments