[7.16](backport #28473) #28472 fix flaky tests in libbeat fmtstr to use time.UTC instead of time.Local

[mergify]

This is an automatic backport of pull request #28473 done by Mergify.
Cherry-pick of db2903b has failed:

On branch mergify/bp/7.16/pr-28473
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[elasticmachine]

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• Start Time: 2021-11-30T17:26:47.736+0000

• Duration: 15 min 37 sec

• Commit: 897fec4

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[ruflin]

Closing this PR as it is empty. @kvch You worked / approved the original PR. Please have a look if something is missing.