[updatecli] update elastic stack version for testing 8.8.0-8d0a4918

[apmmachine]

Bump elastic-stack to latest snapshot version

Update snapshot.yml

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[elasticmachine]

💚 Build Succeeded

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Build stats

• Start Time: 2023-05-08T15:09:54.191+0000

• Duration: 81 min 18 sec

Test stats 🧪

Test	Results
Failed	0
Passed	26297
Skipped	1975
Total	28272

💚 Flaky test report

Tests succeeded.

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[mergify]

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