Incompatibility with anyio v3

[jonathanslenders]

The following issue happens when trying to reproduce the snippet from #2516 on anyio v3:

    | Traceback (most recent call last):
    |   File "/home/jonathan/git/starlette/starlette/middleware/base.py", line 137, in close_recv_stream_on_response_sent
    |     recv_stream.close()
    | AttributeError: 'MemoryObjectReceiveStream' object has no attribute 'close'

The fix is simple:

--- a/starlette/middleware/base.py
+++ b/starlette/middleware/base.py
@@ -134,7 +134,7 @@ class BaseHTTPMiddleware:

             async def close_recv_stream_on_response_sent() -> None:
                 await response_sent.wait()
-                recv_stream.close()
+                await recv_stream.aclose()

             async def send_no_error(message: Message) -> None:
                 try:

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