sklearn.metrics.mean_squared_error and mean_squared_log_error are not deprecated

[InSyncWithFoo]

Only the squared parameter is deprecated (source, docs):

@validate_params(
    {
        "y_true": ["array-like"],
        "y_pred": ["array-like"],
        "sample_weight": ["array-like", None],
        "multioutput": [StrOptions({"raw_values", "uniform_average"}), "array-like"],
        "squared": [Hidden(StrOptions({"deprecated"})), "boolean"],
    },
    prefer_skip_nested_validation=True,
)
def mean_squared_error(
    y_true,
    y_pred,
    *,
    sample_weight=None,
    multioutput="uniform_average",
    squared="deprecated",
):

This was originally reported at this Stack Overflow question.

[debonte]

Sorry for the regression. I misunderstood what had been deprecated and mistakenly introduced this issue in #317.