Update toml-rb to v 4.0

[markhallen]

What are you trying to accomplish?

We want to fully support dependency groups in uv and need to update the toml-rb gem to version 4.

We had issues handling uv dependencies when the dependency-group in the pyproject.toml consited of a mixture of objects and strings. eg #10478 (comment)

Thank you @emancu for the rapid fix emancu/toml-rb#152

Also, closes #10847

Anything you want to highlight for special attention from reviewers?

cc @edgarrmondragon

How will you know you've accomplished your goal?

We tested the dry run with meltano/sdk: ./bin/dry-run.rb uv meltano/sdk. We encountered the error specified before updating the gem and it completed successfully after updating the gem.

Checklist

• I have run the complete test suite to ensure all tests and linters pass.
• I have thoroughly tested my code changes to ensure they work as expected, including adding additional tests for new functionality.
• I have written clear and descriptive commit messages.
• I have provided a detailed description of the changes in the pull request, including the problem it addresses, how it fixes the problem, and any relevant details about the implementation.
• I have ensured that the code is well-documented and easy to understand.

[kbukum1]

LGTM

[MusicalNinjaDad]

Thank you for this ... It's fixed the error and working great!