[7.x] Update to elastic/beats@2871d29be93a (backport #5454)

[mergify]

This is an automatic backport of pull request #5454 done by Mergify.
Cherry-pick of 1860de4 has failed:

On branch mergify/bp/7.x/pr-5454
Your branch is up to date with 'origin/7.x'.

You are currently cherry-picking commit 1860de4b.
  (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:   .go-version
	modified:   Dockerfile
	modified:   README.md
	modified:   tests/Dockerfile

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	both modified:   NOTICE.txt
	deleted by us:   changelogs/head.asciidoc
	both modified:   docs/version.asciidoc
	both modified:   go.mod
	both modified:   go.sum
	both modified:   include/fields.go

To fix up this pull request, you can check it out locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

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[apmmachine]

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Build stats

• Build Cause: Pull request #5589 updated

• Start Time: 2021-06-30T13:22:13.874+0000

• Duration: 37 min 50 sec

• Commit: 1bb8013

Test stats 🧪

Test	Results
Failed	0
Passed	4661
Skipped	105
Total	4766

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