[automation] update elastic stack version for testing 8.1.0-c6173806

[apmmachine]

What

Bump stack version with the latest one.

Further details

[start_time:Tue, 15 Feb 2022 12:14:05 GMT, release_branch:8.1, prefix:, end_time:Tue, 15 Feb 2022 17:24:33 GMT, manifest_version:2.0.0, version:8.1.0-SNAPSHOT, branch:8.1, build_id:8.1.0-c6173806, build_duration_seconds:18628]

[elasticmachine]

💔 Tests Failed

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Build stats

• Start Time: 2022-02-16T05:22:33.555+0000

• Duration: 63 min 55 sec

Test stats 🧪

Test	Results
Failed	1
Passed	248
Skipped	0
Total	249

Test errors

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Initializing / End-To-End Tests / kubernetes-autodiscover_debian_amd64_elastic-agent / [empty] – TEST-x86_64-kubernetes-autodiscover-a1a7466a-2022-02-16-05:53:29.xml

• no error details
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 Test report file /var/lib/jenkins/workspace/PR-2148-1-1494d799-8d4f-4d94-9c6d-33c25cfb44f7/outputs/52.15.218.0/TEST-x86_64-kubernetes-autodiscover-a1a7466a-2022-02-16-05:53:29.xml was length 0 

🐛 Flaky test report

❕ There are test failures but not known flaky tests.

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Genuine test errors

💔 There are test failures but not known flaky tests, most likely a genuine test failure.

• Name: Initializing / End-To-End Tests / kubernetes-autodiscover_debian_amd64_elastic-agent / [empty] – TEST-x86_64-kubernetes-autodiscover-a1a7466a-2022-02-16-05:53:29.xml

🤖 GitHub comments

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• /test : Re-trigger the build.