[updatecli] update elastic stack version for testing 9.3.0-fc9e48de

[github-actions]

Bump elastic-stack to latest snapshot version

Update snapshot.yml

1 file(s) updated with "$1:9.3.0-fc9e48de-SNAPSHOT": * testing/environments/snapshot.yml

GitHub Action workflow link

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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 @github-actions[bot]? 🙏.
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-8./d is the label to automatically backport to the 8./d branch. /d is the digit
• backport-active-all is the label that automatically backports to all active branches.
• backport-active-8 is the label that automatically backports to all active minor branches for the 8 major.
• backport-active-9 is the label that automatically backports to all active minor branches for the 9 major.