[MISC]: Drop vendored tomli import when support for 3.10 is dropped

[teald]

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What happened?

Summary

In our nox automations, we use tomllib in python >= 3.11 to parse the pyproject.toml file and get dependency groups. Instead of injecting a temporary tomli or equivalent dependency to support 3.10, PR #72 used some conditional imports and pip's vendored tomli version.

This is an unstable hack, really only meant to survive until we drop support for Python 3.10 soon.¹

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Footnotes

1. For more information, see SPEC 0, which we use as guidance for what python versions we support. ↩