ci: add .deepsource.toml

[deepsource-autofix]

This pull request adds a .deepsource.toml.

Merging it will successfully integrate DeepSource with this repository. On every subsequent pull request, it will run analysis and report any issues that need to be fixed. Good work!

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[deepsource-io]

Here's the code health analysis summary for commits a0a7697..aaffbb6. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
JavaScript	✅ Success		View Check ↗

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