[updatecli] Bump elastic stack version to 8.9.1

[apmmachine]

Bump elastic stack to latest version

Update elastic stack version to 8.9.1

Updated to content "'8.9.1'" in file ".github/workflows/ci.yml"

8.9.1

Release published on the 2023-08-17 14:16:27 +0000 UTC at the url https://github.com/elastic/elasticsearch/releases/tag/v8.9.1

Downloads: https://elastic.co/downloads/elasticsearch
Release notes: https://www.elastic.co/guide/en/elasticsearch/reference/8.9/release-notes-8.9.1.html

Update elastic stack version to 8.9.1

Updated to content "'8.9.1'" in file ".github/workflows/microbenchmark.yml"

8.9.1

Release published on the 2023-08-17 14:16:27 +0000 UTC at the url https://github.com/elastic/elasticsearch/releases/tag/v8.9.1

Downloads: https://elastic.co/downloads/elasticsearch
Release notes: https://www.elastic.co/guide/en/elasticsearch/reference/8.9/release-notes-8.9.1.html

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