Upgrade JupyterHub to version 5.3.0 in the integration tests workflow

[marcelovilla]

This PR updates the JupyterHub version in the integration tests workflow matrix to ensure the latest release (5.3.0) is tested.

Reference Issues or PRs

What does this implement/fix?

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds a feature)
• Breaking change (fix or feature that would cause existing features not to work as expected)
• Documentation Update
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Build related changes
• Other (please describe):

Testing

• Did you test the pull request locally?
• Did you add new tests?

Documentation

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• The content is written with plain language (where relevant).
• If there are headers, they use the proper header tags (with only one level-one header: H1 or # in markdown).
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• This content adheres to the Nebari style guides.

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[aktech]

Excellent, we should update the same for unit tests as well:

jhub-apps/.github/workflows/test.yml

Line 26 in fed2bc5

- ">=5.0.0"

Update: Never mind, it already ends up installing 5.3.0 - https://github.com/nebari-dev/jhub-apps/actions/runs/15206641129/job/42771226319?pr=613#step:6:176