Build(deps): Bump formulaic from 1.1.1 to 1.2.1

[dependabot]

Bumps formulaic from 1.1.1 to 1.2.1.

Release notes

Sourced from formulaic's releases.

v1.2.1

This is a minor release with only one change: fixing compatibility with the new string dtype in the upcoming release of Pandas 3. (#261)

v1.2.0

Breaking changes:

• Formulaic now targets Python 3.9+ (dropping support for 3.7 and 3.8). (#234)
• ModelSpec.required_variables (and all other .required_variables implementations) now only include the root variable name (e.g. a.fillna -> a), since this is expected to be used to validate that dataframes have the expected columns. The full variable usage is still exposed via .variables and related attributes. You can lookup the the root variable using the .root property of each Variable instance. (#254)

New features and enhancements:

• We now use narwhals for all non-pandas dataframe types supported by narwhals (including polars dataframes and pyarrow tables). This should substantially improve performance for these types since historically the relevant parts of these dataframes were converted lazily to pandas objects. (#189)

Bugfixes and cleanups:

• Fixed compatibility with Scipy 1.16+.
• Factor instances no longer include backticks around factors evaluated using Python so that string representations can be interpreted correctly when parsed anew. (#256)
• FactorValue types are now always unwrapped during categorical encoding due to issues with wrapped numpy arrays.
• The entire code-base was updated to use Python 3.9+ typing annotation idioms.
• The docsite is now versioned (allowing historical versions to be explored).
• Various documentation typo fixes.

Special thanks to @​MarcoGorelli for his help in implementing Narwhals support.

Commits

• 35430e0 1.2.1
• 9fc7b3e Fix compatibility with pandas>=3. (#261)
• b190bba Work around click 8.3 incompatibilities with hatch. (#260)
• 46eb1f2 highlight code snippet in README (#257)
• 61d9bdd 1.2.0
• 86ee6e7 Fully unit test narwhals backend.
• e710f7a Fix type in splines documentation.
• d2596ef Avoid quoting in backticks factors with eval_method of type python. (#256)
• 9f472c8 fix typo (#246)
• 955d664 Only indicate root variables in required_variables. (#254)
• Additional commits viewable in compare view

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