Narwhals v1.39.1

Changes

• fix: collect_schema was failing for DuckDB in narwhals.stable.v1 with Enum type (#2551)
• TYP: Make FrameT more precise (#2542)

✨ Enhancements

• feat: IbisLazyFrame support (#2000)

🛠️ Other improvements

• chore: type left_on / right_on tighter at compliant level (#2548)
• chore: Reuse SeriesT alias more, make more types TYPE_CHECKING-only (#2545)

Thank you to all our contributors for making this release possible!
@FBruzzesi, @MarcoGorelli and @rwhitten577