[FLINK-36465] Bump okhttp3 to 4.12.0

[r-sidd]

What is the purpose of the change

Bump okhttp from 3.14.9 to 4.12.0

Brief change log

Bump okhttp from 3.14.9 to 4.12.0. This will remediate vulnerabilities in underlying dependencies and brings in a lot of bugfixes and features.

Package details:

https://mvnrepository.com/artifact/com.squareup.okhttp3/okhttp/4.12.0

https://mvnrepository.com/artifact/com.squareup.okhttp3/logging-interceptor/4.12.0

Release notes:

https://square.github.io/okhttp/changelogs/upgrading_to_okhttp_4

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:

• 29d70c4 Azure: FAILURE

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