Remove debug `System.out.print` from `Row.java` line 279

[tatu-at-datastax]

So on line 279 (https://github.com/datastax/astra-db-java/blob/main/astra-db-java/src/main/java/com/datastax/astra/client/tables/definition/rows/Row.java#L279) of Row.java we have:

    public Long getBigInt(final String key) {
        System.out.println(get(key));
        return Long.parseLong(String.valueOf(get(key)));
    }

which shouldn't be there.