git: openjdk/jfx: master: 8269597: Change JavaFX release version to 18

[Kevin Rushforth]

Changeset: 787506ff
Author:    Kevin Rushforth <kcr at openjdk.org>
Date:      2021-07-08 16:25:31 +0000
URL:       https://git.openjdk.java.net/jfx/commit/787506ff6c1afada58ee8ea02c5a09817b263dd3

8269597: Change JavaFX release version to 18

Reviewed-by: pbansal, arapte

! build.properties
! modules/javafx.base/src/test/java/test/com/sun/javafx/runtime/VersionInfoTest.java