RFR: JDK-8231505: Bump required boot jdk version to 13

[Magnus Ihse Bursie]

On 2019-10-01 23:37, Erik Joelsson wrote:
> With the release of JDK 13 it is now time to update the required boot 
> jdk version for JDK 14 (to 13). This patch changes the configure 
> requirements as well as bumps the version used for Jib builds at Oracle.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8231505
>
> Webrev: http://cr.openjdk.java.net/~erikj/8231505/webrev.01/
Looks good to me.

/Magnus
>
> /Erik
>