Fix: 修复 setuptools 未安装导致 ImportError

[yanyongyu]

No description provided.

[codecov]

Codecov Report

Merging #1116 (9df57da) into master (6e98ac0) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1116   +/-   ##
=======================================
  Coverage   78.78%   78.78%           
=======================================
  Files          42       42           
  Lines        3182     3182           
=======================================
  Hits         2507     2507           
  Misses        675      675           

Flag	Coverage Δ
unittests	78.78% <100.00%> (ø)

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Impacted Files	Coverage Δ
nonebot/__init__.py	100.00% <100.00%> (ø)

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[github-actions]

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