Fix mypy arg-type error in Redshift Data get_primary_keys

[Lee-W]

Why

In #70501,

    providers/amazon/src/airflow/providers/amazon/aws/hooks/redshift_data.py:274: error: Argument 1 to "get_statement_result" of "RedshiftDataAPIServiceClient" has incompatible type "**dict[str, str]";
    expected "int"  [arg-type]
                    response = self.conn.get_statement_result(**kwargs)
                                                                ^~~~~~

kwargs was infereed as dict[str, int]

What

Annotate it as dict[str, Any]

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