Humble release thread

[sea-bass]

As @rr-tom-noble suggested, we can use this thread to continue discussing Humble releases of MoveIt 2.

As of #3012, a release 2.5.6 was cut.

However, there are already a few more backports/fixes on the Humble branch, and some more upcoming ones.

I would say as a first discussion, we should establish when all these desired changes are in good shape to kick off a 2.5.7. I'd roughly aim for end of 2024, so a month or so from now? Of course, depending on the actual changes needed and when that can be done.

[TSNoble]

Thanks for creating this thread, and end of December sounds good to me 👍