[updatecli] Bump elastic stack version to 8.15.2-e26b3970#14017

mergify[bot] merged 2 commits into8.15elastic/apm-server:8.15from

updatecli_8.15_updatecli-bump-elastic-stack-snapshot-8.15elastic/apm-server:updatecli_8.15_updatecli-bump-elastic-stack-snapshot-8.15Copy head branch name to clipboard