git: openjdk/jdk: 8277517: Bump minimum boot jdk to JDK 18

[Mikael Vidstedt]

Changeset: 46ce2ef1
Author:    Mikael Vidstedt <mikael at openjdk.org>
Date:      2022-04-06 18:49:29 +0000
URL:       https://git.openjdk.java.net/jdk/commit/46ce2ef1d2d81f33cb85c2a99305d558d286da05

8277517: Bump minimum boot jdk to JDK 18

Reviewed-by: darcy, erikj, iris

! make/conf/jib-profiles.js
! make/conf/test-dependencies
! make/conf/version-numbers.conf