[automation] update elastic stack version for testing 8.7.0-188e6a3a

[apmmachine]

What

Bump stack version with the latest one.

Further details

[start_time:Thu, 8 Dec 2022 00:17:45 GMT, release_branch:master, prefix:, end_time:Thu, 8 Dec 2022 04:32:18 GMT, manifest_version:2.1.0, version:8.7.0-SNAPSHOT, branch:master, build_id:8.7.0-188e6a3a, build_duration_seconds:15273]

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[elasticmachine]

💚 Build Succeeded

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Build stats

• Start Time: 2022-12-08T05:18:19.165+0000

• Duration: 17 min 26 sec

Test stats 🧪

Test	Results
Failed	0
Passed	4661
Skipped	13
Total	4674

💚 Flaky test report

Tests succeeded.

🤖 GitHub comments

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To re-run your PR in the CI, just comment with:

• /test : Re-trigger the build.

• /package : Generate the packages.

• run integration tests : Run the Elastic Agent Integration tests.

• run end-to-end tests : Generate the packages and run the E2E Tests.

• run elasticsearch-ci/docs : Re-trigger the docs validation. (use unformatted text in the comment!)

[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	98.333% (59/60)	👍
Files	69.082% (143/207)	👍
Classes	69.133% (271/392)	👍
Methods	53.983% (820/1519)	👍
Lines	39.177% (8876/22656)	👍 0.022
Conditionals	100.0% (0/0)	💚

[mergify]

Automatically approving mergify