chore: fix opensearch keystore password

Author: tstenner

tests/integration/opensearch/config/compose.yaml

@@ -14,7 +14,7 @@ services:
       - plugins.anomaly_detection.enabled=false
       - plugins.security.ssl.http.enabled=true
       - plugins.security.ssl.http.keystore_type=PKCS12
-      # needs to have "changeit" as keystore and key password
+      - plugins.security.ssl.http.keystore_password=NOPASS
       - plugins.security.ssl.http.keystore_filepath=certs/intermediate_server/private/opensearch-secure.p12
       - OPENSEARCH_INITIAL_ADMIN_PASSWORD=Vector2026!
       - DISABLE_PERFORMANCE_ANALYZER_AGENT_CLI=true