Fix intersphinx mapping
The map is supposed to be a dict of tuples, see https://www.sphinx-doc.org/en/master/usage/extensions/intersphinx.html Signed-off-by:Stephen Kitt <steve@sk2.org> Part-of: <!31>
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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
The map is supposed to be a dict of tuples, see https://www.sphinx-doc.org/en/master/usage/extensions/intersphinx.html Signed-off-by:Stephen Kitt <steve@sk2.org> Part-of: <!31>