build(deps): Update polars requirement from <=0.19.15 to <=0.20.1

[dependabot[bot]]

Updates the requirements on polars to permit the latest version.

Release notes

Sourced from polars's releases.

Python Polars 0.20.1

🐞 Bug fixes

• repeat_by should not raise if by contains nulls (#13105)
• [csv] raise on single quote char (#13104)
• Raise if scan zstd compressed csv file (#13102)
• allow timeunit-less dtype in pl.lit creation (#12997)
• Don't check map length if input is literal (#13098)
• rolling_quantile can get incorrect state (#13088)

🛠️ Other improvements

• Fix column name in contains_any example (#13090)
• update user-defined-functions for 0.19.x (#13071)
• Fix some links, and make map_batches warning more evident (#13081)
• Linting updates (#13069)
• take pl.concat out of StringCache context manager in "mismatched string cache" error message (#13076)
• add Enum to dtype list (#13080)

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

Commits

• 2f676fb python polars 0.20.1 (#13108)
• cc7dd7a fix: repeat_by should not raise if by contains nulls (#13105)
• 7616e7a fix: [csv] raise on single quote char (#13104)
• 2013e22 fix: Raise if scan zstd compressed csv file (#13102)
• eb7749e fix(python): allow timeunit-less dtype in pl.lit creation (#12997)
• fcc80b2 chore(rust): don't compile polars-ops by default (#13100)
• 5539c61 fix: Don't check map length if input is literal (#13098)
• c62df51 fix(rust): use FunctionExpr's scalar return type for is_in (#13091)
• 989f508 fix: rolling_quantile can get incorrect state (#13088)
• a49f665 docs(python): Fix column name in contains_any example (#13090)
• Additional commits viewable in compare view

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[dependabot[bot]]

Superseded by #258.