[7.17] ci(slack-message): fix the error (backport #13493) (#13495)

* ci(slack-message): fix the error (#13493)

(cherry picked from commit fd02bb0)

# Conflicts:
#	.github/workflows/benchmarks.yml

* Update .github/workflows/benchmarks.yml

---------

Co-authored-by: Victor Martinez <victormartinezrubio@gmail.com>

.github/workflows/benchmarks.yml

@@ -161,12 +161,11 @@ jobs:
 
       # Notify failure to Slack only on schedule (nightly run)
       - if: failure() && github.event_name == 'schedule'
-        uses: elastic/oblt-actions/slack/notify-result@v1.8.0
+        uses: elastic/oblt-actions/slack/notify-result@v1
         with:
           bot-token: ${{ secrets.SLACK_BOT_TOKEN }}
           channel-id: "#apm-server"
-          message: |
-            Nightly APM Server benchmarks failed! SDH Duty assignee, please have a look and follow this <https://github.com/elastic/observability-dev/blob/main/docs/apm/apm-server/runbooks/benchmarks.md|Runbook>!
+          message: Nightly APM Server benchmarks failed! SDH Duty assignee, please have a look and follow this <https://github.com/elastic/observability-dev/blob/main/docs/apm/apm-server/runbooks/benchmarks.md|Runbook>!
 
       # Notify result to Slack only on schedule (nightly run)
       - if: github.event_name == 'schedule'