Openseries

- Checked and project works with Python 3.13. Project meta data changed to this effect.
- Development updates only otherwise. E.g. adapting to changes in ruff, pandas-stubs etc.

- Changed worst_month() to be consistent with resample_to_business_period_ends().
- Updated Poetry to version 1.8.4.
- Miscellaneous dependency and lockfile updates.

- Added pandas .ffill() as precursor to all remaining pct_change() to suppress pandas FutureWarnings in dependent projects.

- Tightened existing checks to not allow mixed series types as methods input. The coverage level of the checks has not been widened.
- Added pandas .ffill() as precursor to pct_change() to suppress pandas FutureWarnings in dependent projects.
- Fixed method .resample_to_business_period_ends() so it considers renamed labels.
- Corrected warning in this changelog for release of version 1.7.0. Added 'NO'.
- Miscellaneous dependency and lockfile updates.

- Consolidated all_properties() method and its string validations.
- Simplified pandas.pct_change() after new pandas type stubs and fill_method no longer required by mypy.
- Simplified dependencies after bug in statsmodels resolved in version 0.14.3.
- Miscellaneous dependency and lockfile updates

- Replaced the dot operator from numpy and pandas with the Python operator.
- Made OpenTimeSeries Pydantic validator methods private.
- Adjustments to adhere to mypy unreachable code warnings.
- Removed table in security.md to limit maintenance.
- Removed setup_class from readme.md as it was deleted in version 1.7.1.
- Cosmetic improvements on raise exception statements.
- Limited dependency scipy version <1.14.1 due to bug in statsmodels
- Miscellaneous dependency updates