ZOOKEEPER-4709: Upgrade Netty to 4.1.94.Final

[SirOibaf]

Addresses CVE: CVE-2023-34462

[tisonkun]

Thank you! I think it's good to go.

[symat]

Thank you @SirOibaf for the PR!
I also need to have these CVEs fixed, as I am currently working on the release 3.8.2.

Unfortunately it is not enough to change the version in pom.xml. Could you also rename the netty license files (https://github.com/apache/zookeeper/tree/master/zookeeper-server/src/main/resources/lib) to have the new (4.1.94) version in the file names? There are 8 files to rename, as far as I can see.

If you can do that, then I will approve this PR and merge it to all open branches. If you don't have the time, please let me know and I am happy to make an other PR.

Thank you!!!

[SirOibaf]

@symat - I updated the PR.

[symat]

Thank you @SirOibaf for reacting so quickly! I am going to merge the PR now.

[symat]

I merged this to branch-3.8 and master. The cherrypick failed on branch-3.7, but I don't think this is a problem (as 3.7 will be EoL soon).

[symat]

I resolved the conflict, and pushed it also to branch-3.7