Bump sphinx from 3.5.2 to 3.5.3

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 3.5.2 to 3.5.3.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/3.x/CHANGES)
- [Commits](https://github.com/sphinx-doc/sphinx/commits)

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

setup.py

@@ -25,7 +25,7 @@
         "flake8-bugbear==21.3.2",
         "pre-commit~=2.4",
     ],
-    "docs": ["Sphinx==3.5.2", "sphinx-issues==1.2.0", "sphinx-typlog-theme==0.8.0"]
+    "docs": ["Sphinx==3.5.3", "sphinx-issues==1.2.0", "sphinx-typlog-theme==0.8.0"]
     + FRAMEWORKS,
 }
 EXTRAS_REQUIRE["dev"] = EXTRAS_REQUIRE["tests"] + EXTRAS_REQUIRE["lint"] + ["tox"]