[8.14] Create empty changelog for 8.14.1 (backport #13397)

[mergify]

I successfully run run-patch-release workflow but it did not create a PR.

See https://github.com/elastic/apm-server/actions/runs/9470083609/job/26090192913:

pull request create failed: GraphQL: No commits between 8.14 and update-8.14.2 (createPullRequest)
There is no changes 

This PR provides release notes for 8.14.1

---

This is an automatic backport of pull request #13397 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of f96e7d0 has failed:

On branch mergify/bp/8.14/pr-13397
Your branch is up to date with 'origin/8.14'.

You are currently cherry-picking commit f96e7d0a1.
  (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)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   changelogs/8.14.asciidoc

no changes added to commit (use "git add" and/or "git commit -a")

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

[kruskall]

@Mergifyio queue

[mergify]

queue

✅ The pull request has been merged automatically

The pull request has been merged automatically at b000393