[FLINK-38523] Upgrade Pekko to 1.4.0

[mateczagany]

What is the purpose of the change

Upgrades Pekko to 1.4.0 that also uses Netty 4.2.x to stay in line with #27407 and #27469.

Brief change log

• Update Pekko version
• Update NOTICE file

Verifying this change

CI tests should pass

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): yes
• The public API, i.e., is any changed class annotated with @Public(Evolving): no
• The serializers: no
• The runtime per-record code paths (performance sensitive): no
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, ZooKeeper: yes
• The S3 file system connector: no

Documentation

• Does this pull request introduce a new feature? no
• If yes, how is the feature documented? not applicable

[flinkbot]

CI report:

• 92f96c9 Azure: FAILURE

Bot commands

The @flinkbot bot supports the following commands:

• @flinkbot run azure re-run the last Azure build

[mateczagany]

@flinkbot run azure

[mateczagany]

This will only produce passing CI once #27469 is merged