[9.0](backport #6837) chore(go.mod): update beats dependency

[mergify]

This PR updates beats/v7 to point to elastic/beats@ef79280.

This is needed for the recent fixes and work on the beats receivers, for example elastic/beats#42412, elastic/beats#42658, elastic/beats#42707 and elastic/beats#42725.

---

This is an automatic backport of pull request #6837 done by Mergify.

[mergify]

Cherry-pick of e274a84 has failed:

On branch mergify/bp/9.0/pr-6837
Your branch is up to date with 'origin/9.0'.

You are currently cherry-picking commit e274a8411.
  (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:   NOTICE.txt
	modified:   go.mod
	modified:   testing/integration/otel_test.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	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/elastic-agent-control-plane (Team:Elastic-Agent-Control-Plane)

[elasticmachine]

Pinging @elastic/elastic-agent-data-plane (Team:Elastic-Agent-Data-Plane)

[mauri870]

Added you back as reviewers because according to the new policy backports with conflicts need at least a single reviewer other than the author.

[mauri870]

/test

[elastic-sonarqube]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarQube