Narwhals v1.12.1

Changes

✨ Enhancements

• feat: support dataframe.columns for interchange level (#1285)

🛠️ Other improvements

• ci: add marimo tests back (#1286)
• ci: set pre-commit autoupdate to run monthly instead of weekly (#1281)

Thank you to all our contributors for making this release possible!
@MarcoGorelli and @raisadz