Bump jupyter-scheduler to v2.7.0

[arjxn-py]

Reference Issues or PRs

This PR updates the jupyter-scheduler version to v2.7.0, which addresses the issue tracked in jupyter-server/jupyter-scheduler#519.
Also related to nebari-dev/nebari#2548

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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Any other comments?

[arjxn-py]

Hi @marcelovilla, I was able to build the docker image using Dockerfile.jupyterlab as #166 was the issue with all the associated bash file's line endings.
I then wanted to locally reproduce https://www.nebari.dev/docs/tutorials/jupyter-scheduler/, and tried running the docker image but it exits instantly. Is there any specific command that I need to run?

Plus I'm not sure where CI covers this change, I'd be happy to know as it is passing.

[viniciusdc]

@krassowski is this expected to be in the next release?