Update sphinx requirement from <1.9,>=1.8 to >=1.8,<8.3

[dependabot[bot]]

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Updates the requirements on sphinx to permit the latest version.

Release notes

Sourced from sphinx's releases.

Sphinx 8.2.3

Changelog: https://www.sphinx-doc.org/en/master/changes/8.2.html

Commits

• 847ad0c Bump to 8.2.3 final
• 4091fe3 Add CHANGES for Sphinx 8.2.3
• c84c21f Correct the date for Sphinx 8.2.2
• b3881bb Fix _CurrentDocument membership testing with '{c,cpp}:parent_symbol'
• 92b5303 Define _StrPath.__radd__()
• 5739a9d Bump version
• ee96ef3 Bump to 8.2.2 final
• 3e0021c Move Sphinx 8.2.2 CHANGES to doc/changes
• 1a62f31 Fix apidoc extension not setting default header/package name (#13391)
• 13d2899 Replace None filename with '' in Sphinx.add_js_file() (#13402)
• Additional commits viewable in compare view

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