Fix ItemValidationPipeline using __setitem__ without ItemAdapter

[VMRuiz]

No description provided.

[VMRuiz]

I don't think we need to conver to dict here and here but I'm keeping the same logic for now

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.40% 🎉

Comparison is base (e070dd8) 78.64% compared to head (be24262) 79.05%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #415      +/-   ##
==========================================
+ Coverage   78.64%   79.05%   +0.40%     
==========================================
  Files          73       73              
  Lines        3152     3151       -1     
  Branches      528      528              
==========================================
+ Hits         2479     2491      +12     
+ Misses        598      590       -8     
+ Partials       75       70       -5     

Files Changed	Coverage Δ
spidermon/contrib/scrapy/pipelines.py	97.72% <100.00%> (+13.45%)	⬆️

... and 1 file with indirect coverage changes

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