fix: lint

[vinitkumar]

Summary by Sourcery

Fix type stub formatting in json2xml_rs.pyi to satisfy linting and style requirements.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (c4a2ad7) to head (8c19672).

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #365   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            7         7           
  Lines          833       833           
=========================================
  Hits           833       833           

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

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