［WIP] fix(dependencies): update tomlkit version to >=0.8.0,<1.0.0

[Narwhal-fish]

Description

Update the tomlkit dependency in pyproject.toml to >=0.8.0,<1.0.0 to support parsing TOML files with empty keys (e.g., { "" = "src" }).

This PR addresses #1573, which requests an upgrade of tomlkit.
Although the issue was discussed in tomlkit#17, the actual fix was implemented in python-poetry/tomlkit#143 and released in tomlkit v0.8.0.

Checklist

• I have read the contributing guidelines

Code Changes

• Add test cases to all the changes you introduce
• Run poetry all locally to ensure this change passes linter check and tests
• Manually test the changes:
  • Verify the feature/bug fix works as expected in real-world scenarios
  • Test edge cases and error conditions
  • Ensure backward compatibility is maintained
  • Document any manual testing steps performed
• Update the documentation for the changes

Documentation Changes

• Run poetry doc locally to ensure the documentation pages renders correctly
• Check and fix any broken links (internal or external) in the documentation

Expected Behavior

Steps to Test This Pull Request

Additional Context

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (v4-9-0-test@7cd62fb). Learn more about missing BASE report.

Additional details and impacted files

@@              Coverage Diff               @@
##             v4-9-0-test    #1578   +/-   ##
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  Coverage               ?   98.31%           
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  Files                  ?       58           
  Lines                  ?     2671           
  Branches               ?        0           
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  Hits                   ?     2626           
  Misses                 ?       45           
  Partials               ?        0           

Flag	Coverage Δ
unittests	98.31% <ø> (?)

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