[release-20.0] VTAdmin: Upgrade websockets js package (#16504)

[vitess-bot]

Description

This is a backport of #16504

[vitess-bot]

Review Checklist

Hello reviewers! 👋 Please follow this checklist when reviewing this Pull Request.

General

• Ensure that the Pull Request has a descriptive title.
• Ensure there is a link to an issue (except for internal cleanup and flaky test fixes), new features should have an RFC that documents use cases and test cases.

Tests

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Documentation

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Backward compatibility

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