Update dependency sphinx to v5.2.1

This MR contains the following updates:

Package	Update	Change
sphinx (changelog)	patch	==5.2.0.post0 -> ==5.2.1

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Release Notes

sphinx-doc/sphinx

v5.2.1

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Bugs fixed

• #​10861: Always normalise the pycon3 lexer to pycon.
• Fix using sphinx.ext.autosummary with modules containing titles in the module-level docstring.

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