[updatecli] Bump elastic stack version to 8.15.1

[obltmachine]

Bump elastic stack to latest version

Update elastic stack version to 8.15.1

1 file(s) updated with "'8.15.1'": * .github/workflows/microbenchmark.yml

8.15.1

Release published on the 2024-09-05 17:41:31 +0000 UTC at the url https://github.com/elastic/elasticsearch/releases/tag/v8.15.1

Downloads: https://elastic.co/downloads/elasticsearch
Release notes: https://www.elastic.co/guide/en/elasticsearch/reference/8.15/release-notes-8.15.1.html

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