put lowercase param name

src/main/java/com/snowflake/kafka/connector/internal/streaming/StreamingClientProperties.java

@@ -91,7 +91,7 @@ public StreamingClientProperties(Map<String, String> connectorConfig) {
     // Override only if the streaming client properties are explicitly set in config
     this.parameterOverrides = new HashMap<>();
     if (isIcebergEnabled) {
-      parameterOverrides.put("ENABLE_ICEBERG_STREAMING", "true");
+      parameterOverrides.put("enable_iceberg_streaming", "true");
     }
     Optional<String> snowpipeStreamingMaxClientLag =
         Optional.ofNullable(connectorConfig.get(SNOWPIPE_STREAMING_MAX_CLIENT_LAG));