fix(deps): update dependency python-slugify to v9

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
python-slugify (changelog)	>=8.0.4,<9 → >=9,<10

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Release Notes

un33k/python-slugify (python-slugify)

v9.0.0

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• Add keyword-only algorithm='legacy' (permanent default) and explicit algorithm='modern' opt-in, plus CLI --algorithm. Preserve historical default entity ordering, numeric handling, iterator consumption, separator truncation, and public smart_truncate behavior.

• Preserve legacy auto backend selection and two-pass replacement defaults; add explicit backend and replacement_stage keyword-only options and matching CLI flags.

• Add opt-in AnyASCII extra without removing or changing the base text-unidecode dependency.

• Forward CLI --regex-pattern (Jacobo de Vera, #​176; report by @​peter-bloomfield, #​175).

• Modern mode only: decode entities before transliteration; handle invalid numeric references per match, including surrogate references (#​178, #​181, #​187).

• Modern mode only: materialize replacement rules and stopword iterables consistently; preserve bytes/bytearray UTF-8 input with clear rejection of unsupported types (#​183, #​190).

• Modern mode only: budget internal tokens using emitted separator widths, support empty separators, and preserve literal word characters that match delimiters. Public smart_truncate remains unchanged (#​47, #​185, #​186).

• Add regression coverage for whitespace, ordinals, backend-specific output, replacement stages, CLI execution, and installed artifacts.

• Move package metadata to pyproject.toml, retain the typed marker and source tests, and remove the unsafe publish/upload/tag shortcut.

• Document output changes, backend license distinctions, compatibility limits, and migration precautions in docs/release-9/migration.md.

• Support Python 3.14.

• Drop support for Python 3.9 and lower.

• Use tox for local test runs and in CI.

• Test the project against both unidecode and text_unidecode.

• Fix type annotation issues identified by mypy.

• Run CI against pull requests.

• Fix package build warnings.

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