[7.14](backport #26860) [automation] Update go release version 1.16.6

[mergify]

This is an automatic backport of pull request #26860 done by Mergify.
Cherry-pick of 240ee56 has failed:

On branch mergify/bp/7.14/pr-26860
Your branch is up to date with 'origin/7.14'.

You are currently cherry-picking commit 240ee56f3.
  (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:   auditbeat/Dockerfile
	modified:   filebeat/Dockerfile
	modified:   heartbeat/Dockerfile
	modified:   journalbeat/Dockerfile
	modified:   libbeat/Dockerfile
	modified:   metricbeat/Dockerfile
	modified:   packetbeat/Dockerfile
	modified:   x-pack/elastic-agent/Dockerfile
	modified:   x-pack/functionbeat/Dockerfile
	modified:   x-pack/libbeat/Dockerfile

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

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

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[elasticmachine]

💚 Build Succeeded

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• Start Time: 2021-07-15T11:17:23.163+0000

• Duration: 142 min 3 sec

• Commit: c9a6819

Test stats 🧪

Test	Results
Failed	0
Passed	48030
Skipped	5291
Total	53321

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Test stats 🧪

Test	Results
Failed	0
Passed	48030
Skipped	5291
Total	53321