chore: bump polars from 1.20.0 to 1.21.0

[dependabot]

Bumps polars from 1.20.0 to 1.21.0.

Release notes

Sourced from polars's releases.

Python Polars 1.21.0

🚀 Performance improvements

• Use BitmapBuilder in yet more places (#20868)
• Make an owned version of append (#20800)
• Use BitmapBuilder in a lot more places (#20776)

✨ Enhancements

• Stabilize methods/functions (#20850)
• Add linear_space (#20678)
• Improve string → temporal parsing in read_excel and read_ods (#20845)
• Implement df.unique() on new-streaming engine (#20875)
• Experimental credential provider support for Delta read/scan/write (#20842)
• Allow column expressions in DataFrame unnest (#20846)
• Auto-initialize Python credential providers in more cases (#20843)
• Add unique operations for Decimal dtype (#20855)
• Add NDJson sink for the new streaming engine (#20805)
• Support nested keys in window functions (#20837)
• Add CSV sink for the new streaming engine (#20804)
• Periodically check python signals ('CTRL-C' handling) (#20826)
• Experimental unity catalog client (#20798)
• Support cumulative aggregations for Decimal dtype (#20802)
• Account for SurrealDB Python API updates (handle both SurrealDB and AsyncSurrealDB classes) in read_database (#20799)
• Drop nest-asyncio in favor of custom logic (#20793)
• Improve window function caching strategy (#20791)
• Support lakefs:// URI for delta scanner (#20757)
• Additional support for loading numpy.float16 values (as Float32) (#20769)

🐞 Bug fixes

• Warn if asof keys not sorted (#20887)
• Ensure explicit values given to column_widths override autofit in write_excel (#20893)
• Avoid name collisions and panicking in object conversion (#20890)
• Incorrect scale used in log and exp for Decimal type (#20888)
• Don't deep clone manuallydrop in GroupsPosition (#20886)
• Fix DuplicateError when selecting columns after join_where or cross join + filter (#20865)
• Incorrect Decimal value for fill_null(strategy="one") (#20844)
• Fix one edge case (out of many) of int128 literals not working (#20830)
• Add height check to frame-level row indexing when key is int (#20778)
• Remove assert that panics on group_by followed by head(n), where n is larger then the frame height (#20819)
• Selectors should raise on + between themselves (#20825)
• Fix panic InvalidHeaderValue scanning from S3 on Windows (#20820)
• Fix clip for Decimal returning wrong values (#20814)
• Incorrect height from slicing after projecting only the file path column (#20817)
• Shift mask when skipping Bitpacked values in Parquet (#20810)
• Error instead of truncate if length mismatch for several str functions (#20781)
• Support cumulative aggregations for Decimal dtype (#20802)
• Allow is_in values to be given as custom Collection (#20801)
• Propagate null instead of panicking in pl.repeat_by() (#20787)

... (truncated)

Commits

• 1993d59 ci: Disable 'catalog' in build (#20897)
• d6f975c Python Polars 1.21.0 (#20895)
• 7bf42dd feat(python): Stabilize methods/functions (#20850)
• 332bd7d chore: Implement negative slice for new streaming IPC (#20866)
• 8b5b05a fix: Warn if asof keys not sorted (#20887)
• 884feeb fix(python): Ensure explicit values given to column_widths override autofi...
• c465164 feat: Add linear_space (#20678)
• e98e09b refactor(rust): Remove last instances of itoa (#20881)
• 22c7879 refactor(rust): Reduce bloat in static_array_collect by using BitmapBuilders ...
• 45b8e8b refactor(rust): Use defunctionalization in polars-core scalar.rs in order to ...
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