Bump sphinxcontrib-spelling from 5.0.0 to 5.1.0

Bumps [sphinxcontrib-spelling](https://github.com/sphinx-contrib/spelling) from 5.0.0 to 5.1.0.
- [Release notes](https://github.com/sphinx-contrib/spelling/releases)
- [Commits](sphinx-contrib/spelling@5.0.0...5.1.0)

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

Author: dependabot-preview[bot]

dev-requirements.txt

@@ -26,7 +26,7 @@ pyroma==2.6  # Packaging best practices checker
 pytest-cov==2.9.0  # Measure code coverage
 pytest==5.4.3  # Test runners
 sphinx-autodoc-typehints==1.10.3
-sphinxcontrib-spelling==5.0.0
+sphinxcontrib-spelling==5.1.0
 twine==3.1.1
 versioneer==0.18
 vulture==1.5