Bump the minimum version of the JDK needed to run JavaFX to JDK 24 to align with the currently adopted practice of setting the minimum JDK for JavaFX N to JDK N-2. This enhancement must not be backported to any earlier version.

Note that JavaFX 26 is primarily intended for use with JDK 26 and will also be built and tested against JDK 25. Anything older than that, including the proposed minimum JDK 24, is untested.