Utkarsh Verma 4c87f9b594 eng: Fix builds for newer Sphinx versions (>=7)
The current Sphinx theme depends on the `style` parameter which got
deprecated in v5.1 and finally got removed in v7. Now, the `styles` key
should be preferred which is a list of stylesheets. This commit
implements this change.

Closes #4915
2023-06-14 15:45:56 +10:00
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