hg: jdk/sandbox: 8231505: Bump required boot jdk version to 13

[chris.hegarty at oracle.com]

Changeset: 0aa2cdae73ce
Author:    erikj
Date:      2019-10-02 10:04 -0700
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/0aa2cdae73ce

8231505: Bump required boot jdk version to 13
Reviewed-by: darcy, ihse

! make/autoconf/version-numbers
! make/conf/jib-profiles.js