chore(deps): bump polars from 0.20.16 to 0.20.21

[dependabot[bot]]

Bumps polars from 0.20.16 to 0.20.21.

Release notes

Sourced from polars's releases.

Python Polars 0.20.21

🚀 Performance improvements

• Fix regression that led to using only a single thread (#15667)

✨ Enhancements

• add ewm_mean_by (#15638)

🐞 Bug fixes

• Ensure profile of simple-projection only take own runtime (#15671)
• Panic if invalid array in object (#15664)
• Ensure 'CachedSchema' doesn't get synced between plans (#15661)
• group_by multiple null columns produce phantom row (#15659)
• rolling_* aggs were behaving as if they return scalars in group-by (#15657)
• Correct the unsoundness slice range of arr.min/max (#15654)
• list.mean fast path shouldn't produce NaN (#15652)

📖 Documentation

• Add missing deprecation warning to DataFrame.replace (#15612)
• Fix typo in legacy install instructions (#15662)

🛠️ Other improvements

• make Duration.is_constant_duration less strict for non-timezone-aware case (#15639)
• Fix some typos in comments (#15665)
• remove unnecessary unsafe in list mean/sum (#15660)
• fixup failing test due to offset deprecation in upsample (#15636)

Thank you to all our contributors for making this release possible! @​MarcoGorelli, @​Priyansh4444, @​StevenMia, @​eitsupi, @​itamarst, @​mcrumiller, @​orlp, @​reswqa, @​ritchie46 and @​stinodego

Python Polars 0.20.20

🚀 Performance improvements

• Fix cross join batch size when one of the DataFrames is tiny (#14347)
• Fix binview growable complexity O(n*m) -> O(n) (#15628)
• Remove extra thread spawn from row group fetcher (#15626)
• Use vertical parallelism if input is chunked for Filter,Select,WithColumns (#15608)
• Refactor CSV serialization to not go thorough AnyValue (#15576)
• don't use dynamic dispatch in visitors (#15607)
• Improve Bitmap construction performance (#15570)
• join by row-encoding (#15559)

✨ Enhancements

• add Expr.dt.add_business_days and Series.dt.add_business_days (#15595)
• Add str.head and str.tail (#14425)

... (truncated)

Commits

• 3d100a8 python polars 0.20.21 (#15673)
• 1e7fa8e feat: add ewm_mean_by (#15638)
• 8ef2e21 fix: Ensure profile of simple-projection only take own runtime (#15671)
• 19f0939 perf: Fix regression that led to using only a single thread (#15667)
• 08b048d chore(rust): Remove the remaining usage of deprecated numpy crate APIs (#15...
• 6e1620b chore: make Duration.is_constant_duration less strict for non-timezone-aware ...
• 1faf932 fix: Panic if invalid array in object (#15664)
• 2eb575b fix: Ensure 'CachedSchema' doesn't get synced between plans (#15661)
• f800001 docs(python): Add missing deprecation warning to DataFrame.replace (#15612)
• 5bfbad9 chore(rust): Fix some typos in comments (#15665)
• Additional commits viewable in compare view

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[dependabot[bot]]

Superseded by #108.