[updatecli] update elastic stack version for testing 7.17.16-9916f602

[apmmachine]

Generated automatically with https://github.com/elastic/beats/actions/runs/7102604979

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Bump elastic-stack to latest snapshot version

Update snapshot.yml

1 file(s) updated with "$1:7.17.16-9916f602-SNAPSHOT": * testing/environments/snapshot.yml

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• Start Time: 2023-12-05T15:08:20.612+0000

• Duration: 91 min 10 sec

Test stats 🧪

Test	Results
Failed	0
Passed	22415
Skipped	1428
Total	23843

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