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