Netty: Change internal value for netty beta for `partitioned`

[pnicolucci]

https://github.com/OpenLiberty/open-liberty/blob/netty-transport-http/dev/com.ibm.ws.transport.http/src/com/ibm/ws/http/channel/internal/HttpConfigConstants.java#L442

    //TODO -> change internal value for netty beta
    public static final String PROPNAME_SAMESITE_PARTITION = "partitioned";