[updatecli] update elastic stack version for testing 8.9.1-877ad540 (#…

…36210)

<Actions>
<action
id="51718d605d16209e21e6112485cffabfe9a0833a7ee3ee215229826209498a35">
        <h3>Bump elastic-stack to latest snapshot version</h3>
<details
id="e1467303820a62307ce747d1b2cf10db2f7fc32dc526da860cf87f1c25a549fe">
            <summary>Update snapshot.yml</summary>
<p>Updated to content &#34;&#34; in file
&#34;testing/environments/snapshot.yml&#34;&#xA;</p>
        </details>
    </action>
</Actions>

---

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Co-authored-by: apmmachine <[email protected]>

testing/environments/snapshot.yml

@@ -3,7 +3,7 @@
 version: '2.3'
 services:
   elasticsearch:
-    image: docker.elastic.co/elasticsearch/elasticsearch:8.9.1-a0629552-SNAPSHOT
+    image: docker.elastic.co/elasticsearch/elasticsearch:8.9.1-877ad540-SNAPSHOT
     # When extend is used it merges healthcheck.tests, see:
     # https://github.com/docker/compose/issues/8962
     # healthcheck:
@@ -31,7 +31,7 @@ services:
     - "./docker/elasticsearch/users_roles:/usr/share/elasticsearch/config/users_roles"
 
   logstash:
-    image: docker.elastic.co/logstash/logstash:8.9.1-a0629552-SNAPSHOT
+    image: docker.elastic.co/logstash/logstash:8.9.1-877ad540-SNAPSHOT
     healthcheck:
       test: ["CMD", "curl", "-f", "http://localhost:9600/_node/stats"]
       retries: 600
@@ -44,7 +44,7 @@ services:
       - 5055:5055
 
   kibana:
-    image: docker.elastic.co/kibana/kibana:8.9.1-a0629552-SNAPSHOT
+    image: docker.elastic.co/kibana/kibana:8.9.1-877ad540-SNAPSHOT
     environment:
     - "ELASTICSEARCH_USERNAME=kibana_system_user"
     - "ELASTICSEARCH_PASSWORD=testing"