Update Polars to 0.52.0

[billylanchantin]

About

Upgrades Polars dep to 0.52.0

Changes

• The sampling/shuffling seed function changed, so lots of tests had to change to accommodate
• Lots of small floating point churn (normal for these updates)
• Removed a doctest that, due to a trailing series of spaces, doesn't seem possible to represent anymore
• DataType::Categorical internals changed
  • The choices here feel odd: fix: re-implement cat.get_categories to use unique, deviate from Polars narwhals-dev/narwhals#3097
• A bug was fixed with the rolling agg functions with min_periods=1, so a few tests had to change
• Iterating over certain dtypes like datetime had to start using .physical()
• Paths went from std::path::PathBuf to a Polars specific PlPath
• Peak function internals changed