Fix: httpx proxy 与 aiohttp timeout 参数新版本修改

[yanyongyu]

fix #3149

[github-actions]

🚀 Deployed to https://deploy-preview-3152--nonebot2.netlify.app

[yanyongyu]

httpx tests fail due to encode/httpx#3433

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.84%. Comparing base (6dad4d2) to head (fdc0f5d).
Report is 5 commits behind head on master.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3152      +/-   ##
==========================================
- Coverage   93.85%   93.84%   -0.02%     
==========================================
  Files          48       48              
  Lines        4200     4193       -7     
==========================================
- Hits         3942     3935       -7     
  Misses        258      258              

Flag	Coverage Δ
unittests	93.84% <100.00%> (-0.02%)	⬇️

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