fix: update opensearch plugin disable flag

Author: Morgy93

.github/workflows/phpstan.yml

@@ -31,7 +31,7 @@ jobs:
           - 9200:9200
         env:
           discovery.type: single-node
-          plugins.security.disabled: true
+          DISABLE_SECURITY_PLUGIN: true
           OPENSEARCH_JAVA_OPTS: -Xms512m -Xmx512m
         options: --health-cmd="curl http://localhost:9200/_cluster/health" --health-interval=10s --health-timeout=5s --health-retries=10