chore: Update k8s stack yaml files (#14870)

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Co-authored-by: elastic-observability-automation[bot] <180520183+elastic-observability-automation[bot]@users.noreply.github.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

Author: elastic-observability-automation[bot]

testing/infra/k8s/base/stack/apm-server.yaml

@@ -4,7 +4,7 @@ metadata:
   name: apm-server
 spec:
   # TODO: replace with a pinned version such as 9.0.0-aaaaaaaa-SNAPSHOT
-  version: 9.0.0-9fb742a6-SNAPSHOT
+  version: 9.0.0-6e50ee0f-SNAPSHOT
   count: 1
   http:
     tls:

testing/infra/k8s/base/stack/elasticsearch.yaml

@@ -4,7 +4,7 @@ metadata:
   name: elasticsearch
 spec:
   # TODO: replace with a pinned version such as 9.0.0-aaaaaaaa-SNAPSHOT
-  version: 9.0.0-9fb742a6-SNAPSHOT
+  version: 9.0.0-6e50ee0f-SNAPSHOT
   auth:
     fileRealm:
       - secretName: elasticsearch-admin

testing/infra/k8s/base/stack/kibana.yaml

@@ -4,7 +4,7 @@ metadata:
   name: kibana
 spec:
   # TODO: replace with a pinned version such as 9.0.0-aaaaaaaa-SNAPSHOT
-  version: 9.0.0-9fb742a6-SNAPSHOT
+  version: 9.0.0-6e50ee0f-SNAPSHOT
   count: 1
   elasticsearchRef:
     name: elasticsearch