Review fixes for iceberg-1.8:library (open-telemetry#18008)

Co-authored-by: otelbot <197425009+otelbot@users.noreply.github.com>

Author: otelbot[bot]

instrumentation/iceberg-1.8/library/src/main/java/io/opentelemetry/instrumentation/iceberg/v1_8/IcebergTelemetry.java

@@ -19,7 +19,7 @@ public static IcebergTelemetry create(OpenTelemetry openTelemetry) {
     return new IcebergTelemetry(openTelemetry);
   }
 
-  IcebergTelemetry(OpenTelemetry openTelemetry) {
+  private IcebergTelemetry(OpenTelemetry openTelemetry) {
     this.openTelemetry = openTelemetry;
   }