pip prod(deps): update sphinx requirement from <7 to <8 (#75)

Updates the requirements on [sphinx](https://github.com/sphinx-doc/sphinx) to permit the latest version.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/v7.1.2/CHANGES)
- [Commits](sphinx-doc/sphinx@v0.1.61611...v7.1.2)

---
updated-dependencies:
- dependency-name: sphinx
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

pyproject.toml

@@ -34,7 +34,7 @@ python-circos = "^0.3.0"
 anndata = { optional = true, version = ">=0.7.6,<0.10.0" }
 black = { optional = true, version = "*" }
 pytest-cov = { optional = true, version = "*" }
-sphinx = { optional = true, version = "<7" }                         # see issue at https://github.com/readthedocs/readthedocs.org/issues/10279
+sphinx = { optional = true, version = "<8" }                         # see issue at https://github.com/readthedocs/readthedocs.org/issues/10279
 nbsphinx = { optional = true, version = "<=0.9.4" }
 sphinx-autodoc-typehints = { optional = true, version = "<=1.23.0" }
 sphinx_rtd_theme = { optional = true, version = "<=2.0.0" }