[8.19](backport #43352) Update go-libaudit and remove close/draining code

[mergify]

Proposed commit message

This is a continuation of elastic/go-libaudit#176

This is pretty simple, all we're doing besides updating the dependency is removing the old closeAuditClient() code.

Putting this in draft while I tinker with the setPID() method in light of the changes made to go-libaudit.

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

---

This is an automatic backport of pull request #43352 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 5da0bd1 has failed:

On branch mergify/bp/8.19/pr-43352
Your branch is up to date with 'origin/8.19'.

You are currently cherry-picking commit 5da0bd169.
  (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:   auditbeat/module/auditd/audit_linux.go
	modified:   auditbeat/module/auditd/audit_linux_test.go
	modified:   auditbeat/module/auditd/mock_linux_test.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   NOTICE.txt
	both modified:   go.mod
	both modified:   go.sum

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

[elasticmachine]

Pinging @elastic/sec-linux-platform (Team:Security-Linux Platform)

[botelastic]

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[mergify]

This pull request has not been merged yet. Could you please review and merge it @fearful-symmetry? 🙏