fix opensearch readiness probes to use https

manifests/opensearch/cluster.yaml

@@ -34,3 +34,14 @@ spec:
         limits:
           cpu: 500m
           memory: 1Gi
+      probes:
+        readiness:
+          command:
+            - /bin/bash
+            - -c
+            - curl -k -u "$(cat /mnt/admin-credentials/username):$(cat /mnt/admin-credentials/password)" --silent --fail 'https://localhost:9200'
+        startup:
+          command:
+            - /bin/bash
+            - -c
+            - curl -k -u "$(cat /mnt/admin-credentials/username):$(cat /mnt/admin-credentials/password)" --silent --fail 'https://localhost:9200'