Fix: 修复 event 类型检查会对类型进行自动转换

[yanyongyu]

No description provided.

[codecov]

Codecov Report

Merging #876 (d5e272a) into master (fcdb05a) will increase coverage by 0.17%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #876      +/-   ##
==========================================
+ Coverage   76.80%   76.97%   +0.17%     
==========================================
  Files          42       42              
  Lines        3095     3092       -3     
==========================================
+ Hits         2377     2380       +3     
+ Misses        718      712       -6     

Flag	Coverage Δ
unittests	76.97% <100.00%> (+0.17%)	⬆️

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Impacted Files	Coverage Δ
nonebot/internal/params.py	95.75% <100.00%> (+4.09%)	⬆️
nonebot/dependencies/utils.py	85.71% <0.00%> (-3.58%)	⬇️

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[github-actions]

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