[updatecli] Bump elastic stack version to 8.18.4

[elastic-observability-automation]

Bump elastic stack to latest version

Update elastic stack version to 8.18.4

1 file(s) updated with "'8.18.4'": * .github/workflows/microbenchmark.yml

v8.18.4

Downloads: https://elastic.co/downloads/elasticsearch
Release notes: https://www.elastic.co/guide/en/elasticsearch/reference/8.18/release-notes-8.18.4.html

Update elastic stack version to 8.18.4

1 file(s) updated with "'8.18.4'": * .github/workflows/ci.yml

v8.18.4

Downloads: https://elastic.co/downloads/elasticsearch
Release notes: https://www.elastic.co/guide/en/elasticsearch/reference/8.18/release-notes-8.18.4.html

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