v2023.4.2
Basically, only the dependecies updated.
Fastapi updated and brough pydantic 2, so the error messages in the test
changed.
* get_tariff now returns a float (instead of Decimal)
* all dependencies in pyproject are listed as version `"*"`
* they are locked with `poetry.lock`, so nothing could happen
anyway, updating is now easier
This update brought support for the year 2024 **BUT IT IS THE SAME DATA
AS 2023** (which is funnily the same as 2022).
Don't trust that the values are correct (the ballpark usually is, though).