Bump sphinxcontrib-spelling from 5.1.1 to 5.1.2

Bumps [sphinxcontrib-spelling](https://github.com/sphinx-contrib/spelling) from 5.1.1 to 5.1.2.
- [Release notes](https://github.com/sphinx-contrib/spelling/releases)
- [Commits](sphinx-contrib/spelling@5.1.1...5.1.2)

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

Author: dependabot-preview[bot]

dev-requirements.txt

@@ -25,7 +25,7 @@ pyroma==2.6  # Packaging best practices checker
 pytest-cov==2.10.0  # Measure code coverage
 pytest==5.4.3  # Test runners
 sphinx-autodoc-typehints==1.11.0
-sphinxcontrib-spelling==5.1.1
+sphinxcontrib-spelling==5.1.2
 twine==3.1.1
 versioneer==0.18
 vulture==1.5