fix(data-classes): handle keyword arguments in CaseInsensitiveDict.update

[chiruu12]

Issue number: closes #8517

Summary

Changes

CaseInsensitiveDict.update looped over kwargs itself, so it got key strings rather than (key, value) pairs. It now iterates kwargs.items().

Added tests/unit/data_classes/required_dependencies/test_common.py covering keyword arguments in both the constructor and update(). Both tests fail on develop and pass with the change.

User experience

Before, CaseInsensitiveDict(ab=1) produced {'a': 'b'} and any keyword name that is not exactly two characters long raised ValueError, including event.headers.update(User_Agent="test").

After, keyword arguments are stored as lowercased keys with their values, same as a mapping passed positionally.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.92%. Comparing base (556478f) to head (4a25186).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #8518   +/-   ##
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  Coverage    96.92%   96.92%           
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  Files          317      317           
  Lines        15911    15911           
  Branches      1398     1398           
========================================
  Hits         15422    15422           
  Misses         353      353           
  Partials       136      136           

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[leandrodamascena]

Thanks for fixing this, @chiruu12! Glad you caught the two-character case too, since that was silently storing the wrong value. I tried a few extra cases with your fix and they all passed. Looks good to me!

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