dtype=pl.Object not respected when converting pandas object Series

[Wainberg]

Checks

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

Reproducible example

>>> pl.Series(pd.Series([1], dtype=object), dtype=pl.Object)
shape: (1,)
Series: '' [i64]
[
        1
]
>>> pl.Series(pd.Series([], dtype=object), dtype=pl.Object)
shape: (0,)
Series: '' [str]
[
]
>>> pl.Series(pd.Series([np.nan], dtype=object), dtype=pl.Object)
shape: (1,)
Series: '' [null]
[
        null
]
>>> pl.Series(pd.Series([None], dtype=object), dtype=pl.Object)
shape: (1,)
Series: '' [str]
[
        null
]

Log output

No response

Issue description

dtype=pl.Object is not respected when converting pandas object Series to polars.

Expected behavior

The dtype for all of these should be pl.Object.

Installed versions

Replace this line with the output of pl.show_versions(). Leave the backticks in place.

[stinodego]

Thanks, this should indeed be fixed. This will be resolved as part of #14427