[updatecli] update elastic stack version for testing 8.7.1-79685088

[ghost]

Bump elastic-stack to latest snapshot version

Update snapshot.yml

Bump elastic-stack to latest snapshot version

Update snapshot.yml

Bump elastic-stack to latest snapshot version

Update snapshot.yml

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Updatecli options

Most of Updatecli configuration is done via Updatecli manifest.

• If you close this pullrequest, Updatecli will automatically reopen it, the next time it runs.
• If you close this pullrequest, and delete the base branch, Updatecli will automatically recreate it, erasing all previous commits made.

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Action triggered automatically by Updatecli.

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[elasticmachine]

💚 Build Succeeded

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Build stats

• Start Time: 2023-05-02T12:01:23.265+0000

• Duration: 67 min 25 sec

Test stats 🧪

Test	Results
Failed	0
Passed	26010
Skipped	1975
Total	27985

💚 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 and run the E2E tests.

• /beats-tester : Run the installation tests with beats-tester.

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

[rdner]

This PR is blocked by #35274

[mergify]

Automatically approving mergify