[updatecli] update elastic stack version for testing 8.14.0-318ae53b

[apmmachine]

Generated automatically with https://github.com/elastic/beats/actions/runs/8740277405

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Bump elastic-stack to latest snapshot version

Update snapshot.yml

1 file(s) updated with "$1:8.14.0-318ae53b-SNAPSHOT": * testing/environments/snapshot.yml

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[mergify]

This pull request does not have a backport label.
If this is a bug or security fix, could you label this PR @apmmachine? 🙏.
For such, you'll need to label your PR with:

• The upcoming major version of the Elastic Stack
• The upcoming minor version of the Elastic Stack (if you're not pushing a breaking change)

To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-v8./d.0 is the label to automatically backport to the 8./d branch. /d is the digit

[elasticmachine]

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[mergify]

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