[hotfix] Fix npm issue in document Build

[Samrat002]

What is the purpose of the change

Fix Document Build issue due to npm build is getting error .
https://github.com/apache/flink/actions/runs/10212497617

Brief change log

• upgrade protractor dependencies in npm package.json

Verifying this change

Running build action to succeed
https://github.com/apache/flink/actions/runs/10212536568/job/28256049360

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

• Dependencies (does it add or upgrade a dependency): (yes / no)
• The public API, i.e., is any changed class annotated with @Public(Evolving): (yes / no)
• The serializers: (yes / no / don't know)
• The runtime per-record code paths (performance sensitive): (yes / no / don't know)
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (yes / no / don't know)
• The S3 file system connector: (yes / no / don't know)

Documentation

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

[flinkbot]

CI report:

• 304410c Azure: SUCCESS

Bot commands

The @flinkbot bot supports the following commands:

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

[rmetzger]

Minor note: the commit message does not include the [hotfix] prefix.

I don't understand how this change is fixing the npm build issue. Can you explain?