Bump sphinxcontrib-spelling from 7.7.0 to 8.0.0 in /requirements

Bumps [sphinxcontrib-spelling](https://github.com/sphinx-contrib/spelling) from 7.7.0 to 8.0.0.
- [Release notes](https://github.com/sphinx-contrib/spelling/releases)
- [Commits](sphinx-contrib/spelling@7.7.0...8.0.0)

---
updated-dependencies:
- dependency-name: sphinxcontrib-spelling
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements/dev-requirements.txt

@@ -21,7 +21,7 @@ pytest==7.2.1  # Test runners
 ruff==0.0.247
 sphinx-autodoc-typehints==1.22
 sphinx-prompt==1.5.0
-sphinxcontrib-spelling==7.7.0
+sphinxcontrib-spelling==8.0.0
 types-freezegun==1.1.10
 types-requests==2.28.11.13
 types-setuptools==67.3.0.1