[PR #7684/30850ba backport][3.9] Fix #7306 - Set ClientWebSocketResponse.close_code correctly in concu… #7690
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This is a backport of PR #7680 as merged into master (30850ba).
Fixes the issue when If one asyncio task is waiting on receiving data and another asyncio task is closing the connection. The ClientWebSocketResponse.close_code will be None after connection closed.