Backporting fixes:
- Make serde.dataclass always kw-only. (#2428 by @jaheba)
- Fix
serde.dataclass
inheritance handling. (#2512 by @jaheba) - Fix
QuantileForecast.quantile
in case only mean is stored (#2513 by @lostella) - Remove mypy plugin for dataclass. (#2514 by @jaheba)
- GH Actions: Use authenticated requests for just. (#2522 by @jaheba)
- Fix
aggregate_valid
for non-numerical columns (#2526 by @lostella)