Github user NicoK commented on the issue:

    https://github.com/apache/flink/pull/4529
  
    @zhijiangW looks like we're not upgrading the netty version in Flink 1.5 at 
this stage due to the timing, i.e. too quite late in the development cycle. We 
will do the upgrade after releasing Flink 1.5 so that we have enough time to 
test it.
    
    If you want to try out whether an upgrade changes anything for you, please 
feel free to pull from #5571 and upgrade `flink-shaded-netty` in the root 
`pom.xml` to `4.0.56.Final-3.0` once 
[flink-shaded](https://github.com/apache/flink-shaded) 3.0 is released.


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