DO not use datetime.now() in examples

Author: AlenkaF

docs/source/python/getstarted.rst

@@ -152,7 +152,7 @@ and will lazily load chunks of data only when iterating over them
 .. code-block:: python
 
    >>> import datetime
-   >>> current_year = datetime.datetime.now(datetime.UTC).year
+   >>> current_year = 2025
    >>> for table_chunk in birthdays_dataset.to_batches():
    ...     print("AGES", pc.subtract(current_year, table_chunk["years"]))
    AGES [