[7.x] chore: update-beats goal to bump the go version (backport #5778)

[mergify]

This is an automatic backport of pull request #5778 done by Mergify.
Cherry-pick of bcd5bb6 has failed:

On branch mergify/bp/7.x/pr-5778
Your branch is up to date with 'origin/7.x'.

You are currently cherry-picking commit bcd5bb6a.
  (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:   .gitignore
	modified:   Makefile

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   .ci/scripts/update-beats.sh
	both modified:   README.md

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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[apmmachine]

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• Start Time: 2021-07-28T02:02:52.853+0000

• Duration: 44 min 0 sec

• Commit: b20b5b8

Test stats 🧪

Test	Results
Failed	0
Passed	4541
Skipped	15
Total	4556

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