jfx23u open for JavaFX 23.0.1 backports

[Kevin Rushforth]

All,

The jfx24u repo [1] is now open for JavaFX 24.0.1 backports (the April 
2025 CPU release), with approval from one of the project leads. The 
general criteria is that we want to backport fixes for regressions 
introduced in JavaFX 24, third-party library updates, and a limited 
number of other important bug fixes. In most cases we'd like to see the 
fix "bake" in the mainline for a while before being backported to jfx24u.

NOTE: Only those fixes that will NOT be backported to the jfx24 [2] 
stabilization branch are candidates for backporting to jfx24u. A 
backport intended for the JavaFX 24 code line will go into either the 
jfx24 branch or the jfx24u repo, not both.

We use a similar procedure for making the request and noting the 
approval as is used by the JDK updates releases -- by using JBS labels 
to request a backport and indicate approval or rejection.

Here is the procedure:

1. If you are not sure whether something is a good candidate for 
backporting, ask on the mailing list or in the PR you want to backport.

2. Create the backport PR for jfx24u, either manually or using the 
"/backport" command. You can use Skara's "/approval" command to request 
approval. Skara will not mark a jfx24u PR as ready until approved.

Let Johan or me know if you have any questions.

Thanks.

-- Kevin

[1] https://github.com/openjdk/jfx24u
[2] https://github.com/openjdk/jfx/tree/jfx24