fix: BelongsToMany detach 不支持 delete 模型事件

[Nzzz964]

[codecov-commenter]

Codecov Report

Merging #354 (137bc9f) into 2.0 (c82d4a3) will decrease coverage by 0.00%. The diff coverage is 0.00%.

@@             Coverage Diff              @@
##                2.0     #354      +/-   ##
============================================
- Coverage     11.81%   11.81%   -0.01%     
  Complexity     2888     2888              
============================================
  Files            63       63              
  Lines          6795     6796       +1     
============================================
  Hits            803      803              
- Misses         5992     5993       +1     

Flag	Coverage Δ
unittests	11.81% <0.00%> (-0.01%)	:arrow_down:

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Impacted Files	Coverage Δ
src/model/relation/BelongsToMany.php	0.00% <0.00%> (ø)

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