Final tweaks to prepare merging flame_3d.
As can be seen [on the merge
PR](https://github.com/flame-engine/flame/pull/3377), we are almost
ready to have a nice diff to merge. This fixes a couple final issues:
* the `.4 -> 0.4` thing that I had copied from main before merging my
fix into main (this will "untouch" that file from the main diff)
* the min flutter version as set by `melos bs` on the flame_3d package
itself
Update cicd.yml file on flame_3d to match main.
Since we finally updated main, we should require no difference
whatsoever on this file anymore.
This will require downgrading all the color changes, which is fine. This
should never have been a part of flame_3d to begin with.
Files were "untouched" by checking out the exact version as they are in
main right now (will need to rebase flame_3d to main later). I had to
add a couple more files because the files on main had dependencies on
changes that are not yet rebased on flame_3d. These extra diffs should
disappear when I do the final rebase.
