Update sphinx requirement from ~=3.2.1 to >=3.2.1,<8.2.0

Updates the requirements on [sphinx](https://github.com/sphinx-doc/sphinx) to permit the latest version.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v3.2.1...v8.1.3)

---
updated-dependencies:
- dependency-name: sphinx
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

setup.cfg

@@ -71,7 +71,7 @@ dev =
     pytest-watch~=4.2.0
     pytest-xdist~=3.3.1
     pre-commit~=3.3.3
-    sphinx~=3.2.1
+    sphinx>=3.2.1,<8.2.0
     sphinx-rtd-theme~=0.5.0
     tox~=4.11.0
     types-setuptools~=68.1.0.0