Check-manifest

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- Nothing changed yet.

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- Add Python 3.12 and 3.13 support.

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- Add Python 3.11 support.

- Drop Python 3.6 support.

- Exclude more common dev/test files.

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- Add Python 3.10 support.

- Switch to tomli instead of toml, after hearing about PEP-680. tomli will be
included in the Python 3.11 standard library as tomllib, while toml is
apparently unmaintained.

- Fix submodule support when ``.gitmodules`` exists in a subdirectory
(`153 <https://github.com/mgedmin/check-manifest/issues/153>`_).
Note that this reverts a fix for `124
<https://github.com/mgedmin/check-manifest/issues/124>`_: git versions before
2.11 are no longer supported.

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- Fix ``setuptools_scm`` workaround for packages with dashes in the name
(`145 <https://github.com/mgedmin/check-manifest/issues/145>`_).

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- The `pre-commit <https://pre-commit.com>`__ hook now always uses Python 3.