require sphinx<8.2.0

[jameslamb]

Contributes to rapidsai/build-planning#155

Fixes docs builds by temporarily putting a ceiling on sphinx.

Notes for Reviewers

In case you're wondering why you don't see dependencies.yaml changes... this project uses readthedocs to builds its docs.

• builds: https://app.readthedocs.org/projects/ucx-py/builds/
• config:

  ucx-py/.readthedocs.yml

  Lines 16 to 17 in 674e731

  	conda:
  	environment: conda/environments/builddocs.yml

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[jameslamb]

This comment didn't seem to be adding any information (this is already a file called builddocs.yml), so proposing removing it. I'll undo this if reviewers disagree.

[jameslamb]

/ok to test

[jameslamb]

/merge