loading pickled pl.Series of dtype=pl.Array(pl.Enum(...), ...) fails

[egorchakov]

Checks

• I have checked that this issue has not already been reported.
• I have confirmed this bug exists on the latest version of Polars.

Reproducible example

import pickle  # noqa: S403

import polars as pl

series = pl.Series(values=[["a"]], dtype=pl.Array(pl.Enum(["a"]), shape=1))
dumped = pickle.dumps(series)
loaded = pickle.loads(dumped)

Log output

Traceback (most recent call last):
  File "[...]/issue.py", line 7, in <module>
    loaded = pickle.loads(dumped)
             ^^^^^^^^^^^^^^^^^^^^
  File "[...]/.venv/lib/python3.12/site-packages/polars/series/series.py", line 646, in __setstate__
    self._s.__setstate__(state)
polars.exceptions.ComputeError: Dictionary id 0 not found. Valid ids: {}

Issue description

I've been using pl.List as a workaround for the time being.

Expected behavior

pickle.loads succeeds

Installed versions

--------Version info---------
Polars:              1.7.1
Index type:          UInt32
Platform:            Linux-6.2.0-33-generic-x86_64-with-glibc2.35
Python:              3.12.4 (main, Jul 25 2024, 22:42:01) [Clang 18.1.8 ]

----Optional dependencies----
adbc_driver_manager  <not installed>
altair               <not installed>
cloudpickle          3.0.0
connectorx           <not installed>
deltalake            <not installed>
fastexcel            <not installed>
fsspec               2024.9.0
gevent               <not installed>
great_tables         <not installed>
matplotlib           3.9.2
nest_asyncio         <not installed>
numpy                1.26.4
openpyxl             <not installed>
pandas               <not installed>
pyarrow              17.0.0
pydantic             2.9.2
pyiceberg            <not installed>
sqlalchemy           <not installed>
torch                2.4.1+cu121
xlsx2csv             <not installed>
xlsxwriter           <not installed>