Update sphinxcontrib-spelling requirement from ^7.3.0 to ^8.0.0 (#67)

Updates the requirements on [sphinxcontrib-spelling](https://github.com/sphinx-contrib/spelling) to permit the latest version.
- [Release notes](https://github.com/sphinx-contrib/spelling/releases)
- [Commits](https://github.com/sphinx-contrib/spelling/compare/7.3.0...8.0.0)

---
updated-dependencies:
- dependency-name: sphinxcontrib-spelling
  dependency-type: direct:development
...

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pyproject.toml

@@ -23,7 +23,7 @@ flake8 = "^5.0.4"
 pytest = "^7.0.1"
 sphinx-autodoc-typehints = "^1.12.0"
 pyenchant = "^3.2.2"
-sphinxcontrib-spelling = "^7.3.0"
+sphinxcontrib-spelling = "^8.0.0"
 toml = "^0.10.2"
 sphinx-rtd-theme = "^1.0.0"
 sphinx-automodapi = "^0.14"