rename_table should rename primary key index name
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Formerly, `rename_table` only renamed primary key index name if the column's data type was sequential (serial, etc in PostgreSQL). The problem with that is tables whose primary keys had other data types (e.g. UUID) maintained the old primary key name. So for example, if the `cats` table has a UUID primary key, and the table is renamed to `felines`, the primary key index will still be called `cats_pkey` instead of `felines_pkey`. This PR corrects it.