[feature] replace `toml` with `tomli` or standard Python `tomllib`

[drobnyjt]

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Is your feature request related to a problem? Please describe. toml on PyPi has essentially been deprecated; it does not conform perfectly to the newest toml spec and has not been updated in years.

Proposed solution As of 2022, the tomli library has, apparently, become the de-factor toml parser for python. It is used as the backend for the standard library implementation.

Related to Issues #287 #279 #277