Static Analysis: Lambda should be a method reference

[felixYyu]

fix #4376 cc: @RussellSpitzer

[rdblue]

This looks fine to me. What is the motivation? Does this fix a static analysis warning? If so, could you please update the description?

[felixYyu]

this fix a static analysis warning, the static check error log:

iceberg\flink\v1.14\flink\src\main\java\org\apache\iceberg\flink\source\FlinkSplitPlanner.java:73: [LambdaMethodReference] Lambda should be a method reference
          task -> IcebergSourceSplit.fromCombinedScanTask(task)));
          ^
    (see https://github.com/palantir/gradle-baseline#baseline-error-prone-checks)
  Did you mean 'IcebergSourceSplit::fromCombinedScanTask));'?