Add missed spec version 1.12 in the sdf_descriptions target (backport #1529)

[mergify]

🦟 Bug fix

Fixes #

Summary

This also updates the default versions in root.sdf files

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

---

This is an automatic backport of pull request #1529 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of fd0292a has failed:

On branch mergify/bp/sdf14/pr-1529
Your branch is up to date with 'origin/sdf14'.

You are currently cherry-picking commit fd0292a4.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   sdf/1.11/root.sdf
	modified:   sdf/CMakeLists.txt

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   sdf/1.12/root.sdf

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[scpeters]

spec version 1.12 was added in sdf15

[azeey]

Maybe it's better to create a new PR. The title for the backport doesn't really make sense on sdf14.