Fix: aiohttp 驱动未处理 WSMsgType.CLOSED 类型

[shoucandanghehe]

fix nonebot/adapter-discord/issues/52

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.83%. Comparing base (7fbab3d) to head (21e89a7).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3862   +/-   ##
=======================================
  Coverage   93.83%   93.83%           
=======================================
  Files          48       48           
  Lines        4360     4360           
=======================================
  Hits         4091     4091           
  Misses        269      269           

Flag	Coverage Δ
unittests	93.83% <100.00%> (ø)

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[github-actions]

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[yanyongyu]

import 怎么没拿出去