Update iot_ext_item_data_builder.py for Decimal serialization in JSON

[bieli]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 54.54545% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 97.68%. Comparing base (1ef8dd2) to head (580761b).

Files	Patch %	Lines
src/builders/iot_ext_item_data_builder.py	54.54%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #33      +/-   ##
==========================================
- Coverage   98.54%   97.68%   -0.87%     
==========================================
  Files          15       15              
  Lines         551      561      +10     
==========================================
+ Hits          543      548       +5     
- Misses          8       13       +5     

Flag	Coverage Δ
unittests	97.68% <54.54%> (-0.87%)	⬇️

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