[FLINK-28814][Connectors][JDBC] Update org.postgresql:postgresql to 42.4.1

[snuyanzin]

What is the purpose of the change

This a simple update of postgres jdbc driver to cope with CVE-2022-31197 https://github.com/pgjdbc/pgjdbc/security/advisories/GHSA-r38f-c4h4-hqq2

Brief change log

pom file

Verifying this change

This change is a trivial rework / code cleanup without any test coverage.

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: (no )
• 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:

• 4357cda5a755351b8a56f3c513767ec6fe3d8e42 Azure: SUCCESS

Bot commands

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[snuyanzin]

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